XML 35 R53.htm IDEA: XBRL DOCUMENT
v3.20.1

Allowance for Credit Losses and Allowance for Unfunded Commitments and Letters of Credit (Analysis of Credit Quality of the Loan Portfolio) (Details) - USD ($) | Mar. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019 | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing Receivable, Originated in Current Fiscal Year | $ 389,665,000 |  | $ 1,594,130,000 |  |
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year | 1,625,057,000 |  | 1,280,086,000 |  |
Financing Receivable, Originated Two Years before Latest Fiscal Year | 1,199,557,000 |  | 1,125,520,000 |  |
Financing Receivable, Originated Three Years before Latest Fiscal Year | 1,063,447,000 |  | 1,023,452,000 |  |
Financing Receivable, Originated Four Years before Latest Fiscal Year | 975,000,000 |  | 687,055,000 |  |
Financing Receivable, Originated Five or More Years before Latest Fiscal Year | 1,796,247,000 |  | 1,241,613,000 |  |
Financing Receivable, Revolving | 1,853,918,000 |  | 1,713,819,000 |  |
Financing Receivable, Revolving Converted to Term Loans | 30,430,000 |  | 77,790,000 |  |
Loans and Leases Receivable, Net of Deferred Income | 8,933,321,000 |  | 8,743,465,000 |  |
Financing Receivable, Allowance for Credit Loss | 122,074,000 | $ 85,600,000 | 83,968,000 | $ 83,274,000 | $ 83,369,000
Loans, net | 8,811,247,000 |  | 8,659,497,000 |  |
Commercial Real Estate [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing Receivable, Originated in Current Fiscal Year | 171,154,000 |  | 701,207,000 |  |
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year | 717,727,000 |  | 573,995,000 |  |
Financing Receivable, Originated Two Years before Latest Fiscal Year | 553,215,000 |  | 637,452,000 |  |
Financing Receivable, Originated Three Years before Latest Fiscal Year | 624,031,000 |  | 605,517,000 |  |
Financing Receivable, Originated Four Years before Latest Fiscal Year | 586,322,000 |  | 461,498,000 |  |
Financing Receivable, Originated Five or More Years before Latest Fiscal Year | 1,256,179,000 |  | 888,851,000 |  |
Financing Receivable, Revolving | 59,709,000 |  | 52,276,000 |  |
Financing Receivable, Revolving Converted to Term Loans | 1,637,000 |  | 25,057,000 |  |
Loans and Leases Receivable, Net of Deferred Income | 3,969,974,000 |  | 3,945,853,000 |  |
Financing Receivable, Allowance for Credit Loss | 37,122,000 | 27,873,000 | 20,340,000 | 16,359,000 | 14,766,000
Commercial Real Estate [Member] | Pass [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing Receivable, Originated in Current Fiscal Year | 164,265,000 |  | 699,336,000 |  |
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year | 690,076,000 |  | 562,992,000 |  |
Financing Receivable, Originated Two Years before Latest Fiscal Year | 526,063,000 |  | 621,113,000 |  |
Financing Receivable, Originated Three Years before Latest Fiscal Year | 611,317,000 |  | 565,928,000 |  |
Financing Receivable, Originated Four Years before Latest Fiscal Year | 509,264,000 |  | 441,220,000 |  |
Financing Receivable, Originated Five or More Years before Latest Fiscal Year | 1,198,213,000 |  | 873,687,000 |  |
Financing Receivable, Revolving | 59,709,000 |  | 52,276,000 |  |
Financing Receivable, Revolving Converted to Term Loans | 1,637,000 |  | 19,986,000 |  |
Loans and Leases Receivable, Net of Deferred Income | 3,760,544,000 |  | 3,836,538,000 |  |
Commercial Real Estate [Member] | Special Mention [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing Receivable, Originated in Current Fiscal Year | 6,889,000 |  | 1,824,000 |  |
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year | 26,718,000 |  | 305,000 |  |
Financing Receivable, Originated Two Years before Latest Fiscal Year | 5,889,000 |  | 7,019,000 |  |
Financing Receivable, Originated Three Years before Latest Fiscal Year | 5,249,000 |  | 3,360,000 |  |
Financing Receivable, Originated Four Years before Latest Fiscal Year | 37,070,000 |  | 0 |  |
Financing Receivable, Originated Five or More Years before Latest Fiscal Year | 27,729,000 |  | 3,426,000 |  |
Financing Receivable, Revolving | 0 |  | 0 |  |
Financing Receivable, Revolving Converted to Term Loans | 0 |  | 0 |  |
Loans and Leases Receivable, Net of Deferred Income | 109,544,000 |  | 15,934,000 |  |
Commercial Real Estate [Member] | Substandard [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing Receivable, Originated in Current Fiscal Year | 0 |  | 47,000 |  |
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year | 933,000 |  | 10,698,000 |  |
Financing Receivable, Originated Two Years before Latest Fiscal Year | 21,263,000 |  | 9,320,000 |  |
Financing Receivable, Originated Three Years before Latest Fiscal Year | 7,465,000 |  | 36,229,000 |  |
Financing Receivable, Originated Four Years before Latest Fiscal Year | 39,988,000 |  | 20,278,000 |  |
Financing Receivable, Originated Five or More Years before Latest Fiscal Year | 30,237,000 |  | 11,738,000 |  |
Financing Receivable, Revolving | 0 |  | 0 |  |
Financing Receivable, Revolving Converted to Term Loans | 0 |  | 5,071,000 |  |
Loans and Leases Receivable, Net of Deferred Income | 99,886,000 |  | 93,381,000 |  |
Commercial Real Estate [Member] | Doubtful [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing Receivable, Originated in Current Fiscal Year | 0 |  | 0 |  |
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year | 0 |  | 0 |  |
Financing Receivable, Originated Two Years before Latest Fiscal Year | 0 |  | 0 |  |
Financing Receivable, Originated Three Years before Latest Fiscal Year | 0 |  | 0 |  |
Financing Receivable, Originated Four Years before Latest Fiscal Year | 0 |  | 0 |  |
Financing Receivable, Originated Five or More Years before Latest Fiscal Year | 0 |  | 0 |  |
Financing Receivable, Revolving | 0 |  | 0 |  |
Financing Receivable, Revolving Converted to Term Loans | 0 |  | 0 |  |
Loans and Leases Receivable, Net of Deferred Income | 0 |  | 0 |  |
Commercial Business [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing Receivable, Originated in Current Fiscal Year | 145,938,000 |  | 481,807,000 |  |
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year | 500,131,000 |  | 466,135,000 |  |
Financing Receivable, Originated Two Years before Latest Fiscal Year | 434,872,000 |  | 334,448,000 |  |
Financing Receivable, Originated Three Years before Latest Fiscal Year | 309,496,000 |  | 312,877,000 |  |
Financing Receivable, Originated Four Years before Latest Fiscal Year | 285,714,000 |  | 160,715,000 |  |
Financing Receivable, Originated Five or More Years before Latest Fiscal Year | 331,690,000 |  | 203,646,000 |  |
Financing Receivable, Revolving | 1,157,237,000 |  | 1,003,012,000 |  |
Financing Receivable, Revolving Converted to Term Loans | 4,590,000 |  | 26,973,000 |  |
Loans and Leases Receivable, Net of Deferred Income | 3,169,668,000 |  | 2,989,613,000 |  |
Financing Receivable, Allowance for Credit Loss | 45,570,000 | 31,054,000 | 30,292,000 | 34,545,000 | 34,658,000
Commercial Business [Member] | Pass [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing Receivable, Originated in Current Fiscal Year | 144,819,000 |  | 479,481,000 |  |
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year | 454,524,000 |  | 442,222,000 |  |
Financing Receivable, Originated Two Years before Latest Fiscal Year | 379,756,000 |  | 330,934,000 |  |
Financing Receivable, Originated Three Years before Latest Fiscal Year | 282,662,000 |  | 301,337,000 |  |
Financing Receivable, Originated Four Years before Latest Fiscal Year | 249,772,000 |  | 157,436,000 |  |
Financing Receivable, Originated Five or More Years before Latest Fiscal Year | 305,401,000 |  | 199,089,000 |  |
Financing Receivable, Revolving | 1,056,278,000 |  | 963,663,000 |  |
Financing Receivable, Revolving Converted to Term Loans | 1,547,000 |  | 25,577,000 |  |
Loans and Leases Receivable, Net of Deferred Income | 2,874,759,000 |  | 2,899,739,000 |  |
Commercial Business [Member] | Special Mention [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing Receivable, Originated in Current Fiscal Year | 1,119,000 |  | 2,241,000 |  |
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year | 44,237,000 |  | 6,673,000 |  |
Financing Receivable, Originated Two Years before Latest Fiscal Year | 31,717,000 |  | 56,000 |  |
Financing Receivable, Originated Three Years before Latest Fiscal Year | 24,361,000 |  | 2,006,000 |  |
Financing Receivable, Originated Four Years before Latest Fiscal Year | 27,597,000 |  | 52,000 |  |
Financing Receivable, Originated Five or More Years before Latest Fiscal Year | 14,953,000 |  | 585,000 |  |
Financing Receivable, Revolving | 53,274,000 |  | 12,710,000 |  |
Financing Receivable, Revolving Converted to Term Loans | 0 |  | 0 |  |
Loans and Leases Receivable, Net of Deferred Income | 197,258,000 |  | 24,323,000 |  |
Commercial Business [Member] | Substandard [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing Receivable, Originated in Current Fiscal Year | 0 |  | 85,000 |  |
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year | 1,370,000 |  | 17,240,000 |  |
Financing Receivable, Originated Two Years before Latest Fiscal Year | 23,399,000 |  | 3,458,000 |  |
Financing Receivable, Originated Three Years before Latest Fiscal Year | 2,473,000 |  | 9,534,000 |  |
Financing Receivable, Originated Four Years before Latest Fiscal Year | 8,345,000 |  | 3,227,000 |  |
Financing Receivable, Originated Five or More Years before Latest Fiscal Year | 11,336,000 |  | 3,972,000 |  |
Financing Receivable, Revolving | 47,685,000 |  | 26,639,000 |  |
Financing Receivable, Revolving Converted to Term Loans | 3,043,000 |  | 1,396,000 |  |
Loans and Leases Receivable, Net of Deferred Income | 97,651,000 |  | 65,551,000 |  |
Commercial Business [Member] | Doubtful [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing Receivable, Originated in Current Fiscal Year | 0 |  | 0 |  |
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year | 0 |  | 0 |  |
Financing Receivable, Originated Two Years before Latest Fiscal Year | 0 |  | 0 |  |
Financing Receivable, Originated Three Years before Latest Fiscal Year | 0 |  | 0 |  |
Financing Receivable, Originated Four Years before Latest Fiscal Year | 0 |  | 0 |  |
Financing Receivable, Originated Five or More Years before Latest Fiscal Year | 0 |  | 0 |  |
Financing Receivable, Revolving | 0 |  | 0 |  |
Financing Receivable, Revolving Converted to Term Loans | 0 |  | 0 |  |
Loans and Leases Receivable, Net of Deferred Income | 0 |  | 0 |  |
Agriculture [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing Receivable, Originated in Current Fiscal Year | 24,539,000 |  | 115,000,000 |  |
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year | 124,096,000 |  | 63,532,000 |  |
Financing Receivable, Originated Two Years before Latest Fiscal Year | 54,850,000 |  | 77,891,000 |  |
Financing Receivable, Originated Three Years before Latest Fiscal Year | 71,035,000 |  | 77,781,000 |  |
Financing Receivable, Originated Four Years before Latest Fiscal Year | 73,602,000 |  | 35,138,000 |  |
Financing Receivable, Originated Five or More Years before Latest Fiscal Year | 90,482,000 |  | 62,616,000 |  |
Financing Receivable, Revolving | 306,342,000 |  | 316,989,000 |  |
Financing Receivable, Revolving Converted to Term Loans | 9,545,000 |  | 16,424,000 |  |
Loans and Leases Receivable, Net of Deferred Income | 754,491,000 |  | 765,371,000 |  |
Financing Receivable, Allowance for Credit Loss | 11,085,000 | 6,510,000 | 15,835,000 | 10,690,000 | 9,589,000
Agriculture [Member] | Pass [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing Receivable, Originated in Current Fiscal Year | 23,639,000 |  | 107,152,000 |  |
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year | 105,950,000 |  | 54,950,000 |  |
Financing Receivable, Originated Two Years before Latest Fiscal Year | 48,643,000 |  | 70,337,000 |  |
Financing Receivable, Originated Three Years before Latest Fiscal Year | 64,450,000 |  | 71,874,000 |  |
Financing Receivable, Originated Four Years before Latest Fiscal Year | 65,316,000 |  | 33,597,000 |  |
Financing Receivable, Originated Five or More Years before Latest Fiscal Year | 84,182,000 |  | 56,342,000 |  |
Financing Receivable, Revolving | 249,785,000 |  | 280,984,000 |  |
Financing Receivable, Revolving Converted to Term Loans | 7,026,000 |  | 10,036,000 |  |
Loans and Leases Receivable, Net of Deferred Income | 648,991,000 |  | 685,272,000 |  |
Agriculture [Member] | Special Mention [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing Receivable, Originated in Current Fiscal Year | 0 |  | 557,000 |  |
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year | 189,000 |  | 2,535,000 |  |
Financing Receivable, Originated Two Years before Latest Fiscal Year | 670,000 |  | 1,381,000 |  |
Financing Receivable, Originated Three Years before Latest Fiscal Year | 747,000 |  | 0 |  |
Financing Receivable, Originated Four Years before Latest Fiscal Year | 1,687,000 |  | 64,000 |  |
Financing Receivable, Originated Five or More Years before Latest Fiscal Year | 64,000 |  | 576,000 |  |
Financing Receivable, Revolving | 5,207,000 |  | 5,336,000 |  |
Financing Receivable, Revolving Converted to Term Loans | 0 |  | 0 |  |
Loans and Leases Receivable, Net of Deferred Income | 8,564,000 |  | 10,449,000 |  |
Agriculture [Member] | Substandard [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing Receivable, Originated in Current Fiscal Year | 900,000 |  | 7,291,000 |  |
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year | 17,957,000 |  | 6,047,000 |  |
Financing Receivable, Originated Two Years before Latest Fiscal Year | 5,537,000 |  | 6,173,000 |  |
Financing Receivable, Originated Three Years before Latest Fiscal Year | 5,838,000 |  | 5,907,000 |  |
Financing Receivable, Originated Four Years before Latest Fiscal Year | 6,599,000 |  | 1,477,000 |  |
Financing Receivable, Originated Five or More Years before Latest Fiscal Year | 6,236,000 |  | 5,698,000 |  |
Financing Receivable, Revolving | 51,350,000 |  | 30,669,000 |  |
Financing Receivable, Revolving Converted to Term Loans | 2,519,000 |  | 6,388,000 |  |
Loans and Leases Receivable, Net of Deferred Income | 96,936,000 |  | 69,650,000 |  |
Agriculture [Member] | Doubtful [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing Receivable, Originated in Current Fiscal Year | 0 |  | 0 |  |
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year | 0 |  | 0 |  |
Financing Receivable, Originated Two Years before Latest Fiscal Year | 0 |  | 0 |  |
Financing Receivable, Originated Three Years before Latest Fiscal Year | 0 |  | 0 |  |
Financing Receivable, Originated Four Years before Latest Fiscal Year | 0 |  | 0 |  |
Financing Receivable, Originated Five or More Years before Latest Fiscal Year | 0 |  | 0 |  |
Financing Receivable, Revolving | 0 |  | 0 |  |
Financing Receivable, Revolving Converted to Term Loans | 0 |  | 0 |  |
Loans and Leases Receivable, Net of Deferred Income | 0 |  | 0 |  |
Construction [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing Receivable, Originated in Current Fiscal Year | 23,340,000 |  | 183,525,000 |  |
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year | 173,305,000 |  | 92,606,000 |  |
Financing Receivable, Originated Two Years before Latest Fiscal Year | 62,269,000 |  | 40,514,000 |  |
Financing Receivable, Originated Three Years before Latest Fiscal Year | 18,838,000 |  | 1,067,000 |  |
Financing Receivable, Originated Four Years before Latest Fiscal Year | 1,046,000 |  | 939,000 |  |
Financing Receivable, Originated Five or More Years before Latest Fiscal Year | 2,380,000 |  | 1,660,000 |  |
Financing Receivable, Revolving | 12,887,000 |  | 33,429,000 |  |
Financing Receivable, Revolving Converted to Term Loans | 14,121,000 |  | 7,793,000 |  |
Loans and Leases Receivable, Net of Deferred Income | 308,186,000 |  | 361,533,000 |  |
Financing Receivable, Allowance for Credit Loss | 8,845,000 | 6,821,000 | 8,571,000 | 11,965,000 | 14,395,000
Construction [Member] | Pass [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing Receivable, Originated in Current Fiscal Year | 23,340,000 |  | 183,525,000 |  |
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year | 173,088,000 |  | 91,342,000 |  |
Financing Receivable, Originated Two Years before Latest Fiscal Year | 61,777,000 |  | 40,514,000 |  |
Financing Receivable, Originated Three Years before Latest Fiscal Year | 18,838,000 |  | 1,067,000 |  |
Financing Receivable, Originated Four Years before Latest Fiscal Year | 1,046,000 |  | 939,000 |  |
Financing Receivable, Originated Five or More Years before Latest Fiscal Year | 2,322,000 |  | 1,601,000 |  |
Financing Receivable, Revolving | 12,846,000 |  | 33,388,000 |  |
Financing Receivable, Revolving Converted to Term Loans | 14,121,000 |  | 7,793,000 |  |
Loans and Leases Receivable, Net of Deferred Income | 307,378,000 |  | 360,169,000 |  |
Construction [Member] | Special Mention [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing Receivable, Originated in Current Fiscal Year | 0 |  | 0 |  |
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year | 0 |  | 1,264,000 |  |
Financing Receivable, Originated Two Years before Latest Fiscal Year | 492,000 |  | 0 |  |
Financing Receivable, Originated Three Years before Latest Fiscal Year | 0 |  | 0 |  |
Financing Receivable, Originated Four Years before Latest Fiscal Year | 0 |  | 0 |  |
Financing Receivable, Originated Five or More Years before Latest Fiscal Year | 0 |  | 0 |  |
Financing Receivable, Revolving | 41,000 |  | 41,000 |  |
Financing Receivable, Revolving Converted to Term Loans | 0 |  | 0 |  |
Loans and Leases Receivable, Net of Deferred Income | 533,000 |  | 1,305,000 |  |
Construction [Member] | Substandard [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing Receivable, Originated in Current Fiscal Year | 0 |  | 0 |  |
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year | 217,000 |  | 0 |  |
Financing Receivable, Originated Two Years before Latest Fiscal Year | 0 |  | 0 |  |
Financing Receivable, Originated Three Years before Latest Fiscal Year | 0 |  | 0 |  |
Financing Receivable, Originated Four Years before Latest Fiscal Year | 0 |  | 0 |  |
Financing Receivable, Originated Five or More Years before Latest Fiscal Year | 58,000 |  | 59,000 |  |
Financing Receivable, Revolving | 0 |  | 0 |  |
Financing Receivable, Revolving Converted to Term Loans | 0 |  | 0 |  |
Loans and Leases Receivable, Net of Deferred Income | 275,000 |  | 59,000 |  |
Construction [Member] | Doubtful [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing Receivable, Originated in Current Fiscal Year | 0 |  | 0 |  |
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year | 0 |  | 0 |  |
Financing Receivable, Originated Two Years before Latest Fiscal Year | 0 |  | 0 |  |
Financing Receivable, Originated Three Years before Latest Fiscal Year | 0 |  | 0 |  |
Financing Receivable, Originated Four Years before Latest Fiscal Year | 0 |  | 0 |  |
Financing Receivable, Originated Five or More Years before Latest Fiscal Year | 0 |  | 0 |  |
Financing Receivable, Revolving | 0 |  | 0 |  |
Financing Receivable, Revolving Converted to Term Loans | 0 |  | 0 |  |
Loans and Leases Receivable, Net of Deferred Income | 0 |  | 0 |  |
One-to-Four Family Residential [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing Receivable, Originated in Current Fiscal Year | 21,809,000 |  | 103,315,000 |  |
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year | 105,016,000 |  | 78,105,000 |  |
Financing Receivable, Originated Two Years before Latest Fiscal Year | 88,882,000 |  | 33,240,000 |  |
Financing Receivable, Originated Three Years before Latest Fiscal Year | 38,378,000 |  | 25,452,000 |  |
Financing Receivable, Originated Four Years before Latest Fiscal Year | 27,778,000 |  | 27,917,000 |  |
Financing Receivable, Originated Five or More Years before Latest Fiscal Year | 113,584,000 |  | 83,526,000 |  |
Financing Receivable, Revolving | 294,964,000 |  | 284,735,000 |  |
Financing Receivable, Revolving Converted to Term Loans | 95,000 |  | 1,035,000 |  |
Loans and Leases Receivable, Net of Deferred Income | 690,506,000 |  | 637,325,000 |  |
Financing Receivable, Allowance for Credit Loss | 17,659,000 | 11,672,000 | 7,435,000 | 8,311,000 | 8,024,000
One-to-Four Family Residential [Member] | Pass [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing Receivable, Originated in Current Fiscal Year | 21,809,000 |  | 103,315,000 |  |
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year | 104,274,000 |  | 77,877,000 |  |
Financing Receivable, Originated Two Years before Latest Fiscal Year | 88,655,000 |  | 32,440,000 |  |
Financing Receivable, Originated Three Years before Latest Fiscal Year | 37,480,000 |  | 25,052,000 |  |
Financing Receivable, Originated Four Years before Latest Fiscal Year | 27,379,000 |  | 27,294,000 |  |
Financing Receivable, Originated Five or More Years before Latest Fiscal Year | 110,624,000 |  | 80,370,000 |  |
Financing Receivable, Revolving | 294,074,000 |  | 283,830,000 |  |
Financing Receivable, Revolving Converted to Term Loans | 80,000 |  | 554,000 |  |
Loans and Leases Receivable, Net of Deferred Income | 684,375,000 |  | 630,732,000 |  |
One-to-Four Family Residential [Member] | Special Mention [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing Receivable, Originated in Current Fiscal Year | 0 |  | 0 |  |
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year | 0 |  | 0 |  |
Financing Receivable, Originated Two Years before Latest Fiscal Year | 0 |  | 0 |  |
Financing Receivable, Originated Three Years before Latest Fiscal Year | 0 |  | 0 |  |
Financing Receivable, Originated Four Years before Latest Fiscal Year | 0 |  | 0 |  |
Financing Receivable, Originated Five or More Years before Latest Fiscal Year | 0 |  | 0 |  |
Financing Receivable, Revolving | 0 |  | 0 |  |
Financing Receivable, Revolving Converted to Term Loans | 0 |  | 0 |  |
Loans and Leases Receivable, Net of Deferred Income | 0 |  | 0 |  |
One-to-Four Family Residential [Member] | Substandard [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing Receivable, Originated in Current Fiscal Year | 0 |  | 0 |  |
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year | 742,000 |  | 228,000 |  |
Financing Receivable, Originated Two Years before Latest Fiscal Year | 227,000 |  | 800,000 |  |
Financing Receivable, Originated Three Years before Latest Fiscal Year | 898,000 |  | 400,000 |  |
Financing Receivable, Originated Four Years before Latest Fiscal Year | 399,000 |  | 623,000 |  |
Financing Receivable, Originated Five or More Years before Latest Fiscal Year | 2,960,000 |  | 3,156,000 |  |
Financing Receivable, Revolving | 890,000 |  | 905,000 |  |
Financing Receivable, Revolving Converted to Term Loans | 15,000 |  | 481,000 |  |
Loans and Leases Receivable, Net of Deferred Income | 6,131,000 |  | 6,593,000 |  |
One-to-Four Family Residential [Member] | Doubtful [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing Receivable, Originated in Current Fiscal Year | 0 |  | 0 |  |
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year | 0 |  | 0 |  |
Financing Receivable, Originated Two Years before Latest Fiscal Year | 0 |  | 0 |  |
Financing Receivable, Originated Three Years before Latest Fiscal Year | 0 |  | 0 |  |
Financing Receivable, Originated Four Years before Latest Fiscal Year | 0 |  | 0 |  |
Financing Receivable, Originated Five or More Years before Latest Fiscal Year | 0 |  | 0 |  |
Financing Receivable, Revolving | 0 |  | 0 |  |
Financing Receivable, Revolving Converted to Term Loans | 0 |  | 0 |  |
Loans and Leases Receivable, Net of Deferred Income | 0 |  | 0 |  |
Consumer Loan [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing Receivable, Originated in Current Fiscal Year | 2,885,000 |  | 9,276,000 |  |
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year | 4,782,000 |  | 5,713,000 |  |
Financing Receivable, Originated Two Years before Latest Fiscal Year | 5,469,000 |  | 1,975,000 |  |
Financing Receivable, Originated Three Years before Latest Fiscal Year | 1,669,000 |  | 758,000 |  |
Financing Receivable, Originated Four Years before Latest Fiscal Year | 538,000 |  | 848,000 |  |
Financing Receivable, Originated Five or More Years before Latest Fiscal Year | 1,932,000 |  | 1,314,000 |  |
Financing Receivable, Revolving | 22,779,000 |  | 23,378,000 |  |
Financing Receivable, Revolving Converted to Term Loans | 442,000 |  | 508,000 |  |
Loans and Leases Receivable, Net of Deferred Income | 40,496,000 |  | 43,770,000 |  |
Financing Receivable, Allowance for Credit Loss | 1,644,000 | $ 1,661,000 | 883,000 | $ 823,000 | $ 787,000
Consumer Loan [Member] | Pass [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing Receivable, Originated in Current Fiscal Year | 2,885,000 |  | 9,276,000 |  |
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year | 4,782,000 |  | 5,713,000 |  |
Financing Receivable, Originated Two Years before Latest Fiscal Year | 5,469,000 |  | 1,974,000 |  |
Financing Receivable, Originated Three Years before Latest Fiscal Year | 1,669,000 |  | 758,000 |  |
Financing Receivable, Originated Four Years before Latest Fiscal Year | 538,000 |  | 848,000 |  |
Financing Receivable, Originated Five or More Years before Latest Fiscal Year | 1,863,000 |  | 1,306,000 |  |
Financing Receivable, Revolving | 22,747,000 |  | 23,351,000 |  |
Financing Receivable, Revolving Converted to Term Loans | 442,000 |  | 508,000 |  |
Loans and Leases Receivable, Net of Deferred Income | 40,395,000 |  | 43,734,000 |  |
Consumer Loan [Member] | Special Mention [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing Receivable, Originated in Current Fiscal Year | 0 |  | 0 |  |
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year | 0 |  | 0 |  |
Financing Receivable, Originated Two Years before Latest Fiscal Year | 0 |  | 0 |  |
Financing Receivable, Originated Three Years before Latest Fiscal Year | 0 |  | 0 |  |
Financing Receivable, Originated Four Years before Latest Fiscal Year | 0 |  | 0 |  |
Financing Receivable, Originated Five or More Years before Latest Fiscal Year | 0 |  | 0 |  |
Financing Receivable, Revolving | 0 |  | 0 |  |
Financing Receivable, Revolving Converted to Term Loans | 0 |  | 0 |  |
Loans and Leases Receivable, Net of Deferred Income | 0 |  | 0 |  |
Consumer Loan [Member] | Substandard [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing Receivable, Originated in Current Fiscal Year | 0 |  | 0 |  |
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year | 0 |  | 0 |  |
Financing Receivable, Originated Two Years before Latest Fiscal Year | 0 |  | 1,000 |  |
Financing Receivable, Originated Three Years before Latest Fiscal Year | 0 |  | 0 |  |
Financing Receivable, Originated Four Years before Latest Fiscal Year | 0 |  | 0 |  |
Financing Receivable, Originated Five or More Years before Latest Fiscal Year | 69,000 |  | 8,000 |  |
Financing Receivable, Revolving | 32,000 |  | 27,000 |  |
Financing Receivable, Revolving Converted to Term Loans | 0 |  | 0 |  |
Loans and Leases Receivable, Net of Deferred Income | 101,000 |  | 36,000 |  |
Consumer Loan [Member] | Doubtful [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Financing Receivable, Originated in Current Fiscal Year | 0 |  | 0 |  |
Financing Receivable, Originated in Fiscal Year before Latest Fiscal Year | 0 |  | 0 |  |
Financing Receivable, Originated Two Years before Latest Fiscal Year | 0 |  | 0 |  |
Financing Receivable, Originated Three Years before Latest Fiscal Year | 0 |  | 0 |  |
Financing Receivable, Originated Four Years before Latest Fiscal Year | 0 |  | 0 |  |
Financing Receivable, Originated Five or More Years before Latest Fiscal Year | 0 |  | 0 |  |
Financing Receivable, Revolving | 0 |  | 0 |  |
Financing Receivable, Revolving Converted to Term Loans | 0 |  | 0 |  |
Loans and Leases Receivable, Net of Deferred Income | $ 0 |  | $ 0 |  |

X
- Definition Financing Receivable, Revolving Converted to Term Loans + References No definition available. + Details
Name: | colb_FinancingReceivableRevolvingConvertedtoTermLoans
Namespace Prefix: | colb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118955202&loc=SL82895884-210446 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447 + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLosses
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of financing receivable originated five or more years prior to latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=118955255&loc=SL82922352-210448 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919232-210447 + Details
Name: | us-gaap_FinancingReceivableOriginatedFiveOrMoreYearsBeforeLatestFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of financing receivable originated four years prior to latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=118955255&loc=SL82922352-210448 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919232-210447 + Details
Name: | us-gaap_FinancingReceivableOriginatedFourYearsBeforeLatestFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of financing receivable originated in current fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=118955255&loc=SL82922352-210448 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919232-210447 + Details
Name: | us-gaap_FinancingReceivableOriginatedInCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of financing receivable originated in fiscal year prior to latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919232-210447 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=118955255&loc=SL82922352-210448 + Details
Name: | us-gaap_FinancingReceivableOriginatedInFiscalYearBeforeLatestFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of financing receivable originated three years prior to latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=118955255&loc=SL82922352-210448 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919232-210447 + Details
Name: | us-gaap_FinancingReceivableOriginatedThreeYearsBeforeLatestFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of financing receivable originated two years prior to latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=118955255&loc=SL82922352-210448 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919232-210447 + Details
Name: | us-gaap_FinancingReceivableOriginatedTwoYearsBeforeLatestFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of financing receivable that can be withdrawn, repaid and redrawn. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919232-210447 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=118955255&loc=SL82922352-210448 + Details
Name: | us-gaap_FinancingReceivableRevolving
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118952595&loc=d3e4428-111522 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5074-111524 + Details
Name: | us-gaap_LoansAndLeasesReceivableNetOfDeferredIncome
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount after allowance and deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements and loans held for sale. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118952595&loc=d3e4428-111522 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
Name: | us-gaap_LoansAndLeasesReceivableNetReportedAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_CommercialRealEstateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=us-gaap_PassMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=us-gaap_SpecialMentionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=us-gaap_SubstandardMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=us-gaap_DoubtfulMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=colb_CommercialBusinessMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=colb_AgricultureMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_ConstructionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=colb_OneToFourFamilyResidentialMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_ConsumerLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |