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Loans Loans - Weighted Average Risk Grade for All Commercial Loans by Class and Year of Origination (Details)
$ in Thousands
Mar. 31, 2022
USD ($)
Grade
Dec. 31, 2021
USD ($)
Grade
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Net of Deferred Income $ 16,542,537 $ 16,336,397
Commercial Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Year One, Originated, Current Fiscal Year 844,354  
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 953,664  
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 616,642  
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 331,729  
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 189,719  
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 255,999  
Financing Receivable, Revolving 2,331,781  
Loans and Leases Receivable, Net of Deferred Income $ 5,584,117 $ 5,364,954
Weighted Average Risk Grade For Loans | Grade 6.34 6.22
Commercial and Industrial Total Energy Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Year One, Originated, Current Fiscal Year $ 289,573  
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 125,803  
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 8,629  
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 18,726  
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 6,603  
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 5,843  
Financing Receivable, Revolving 521,322  
Loans and Leases Receivable, Net of Deferred Income $ 1,036,579 $ 1,077,792
Weighted Average Risk Grade For Loans | Grade 5.89 6.06
Commercial Real Estate Buildings Land And Other Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Year One, Originated, Current Fiscal Year $ 660,171  
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 1,606,760  
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 1,231,072  
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 938,002  
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 553,657  
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 1,200,107  
Financing Receivable, Revolving 81,435  
Loans and Leases Receivable, Net of Deferred Income $ 6,376,521 $ 6,272,339
Weighted Average Risk Grade For Loans | Grade 7.14 7.22
Construction Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Year One, Originated, Current Fiscal Year $ 202,584  
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 662,966  
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 201,069  
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 141,510  
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 636  
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 2,265  
Financing Receivable, Revolving 207,182  
Loans and Leases Receivable, Net of Deferred Income $ 1,421,878 $ 1,304,271
Weighted Average Risk Grade For Loans | Grade 7.01 7.06
Commercial Real Estate Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Year One, Originated, Current Fiscal Year $ 862,755  
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 2,269,726  
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 1,432,141  
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 1,079,512  
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 554,293  
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 1,202,372  
Financing Receivable, Revolving 288,617  
Loans and Leases Receivable, Net of Deferred Income $ 7,798,399 $ 7,576,610
Weighted Average Risk Grade For Loans | Grade 7.11 7.19
Risk Grade One To Eight [Member] | Commercial Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Year One, Originated, Current Fiscal Year $ 836,152  
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 894,663  
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 592,780  
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 305,667  
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 160,622  
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 243,869  
Financing Receivable, Revolving 2,255,878  
Loans and Leases Receivable, Net of Deferred Income $ 5,334,409 $ 5,063,847
Weighted Average Risk Grade For Loans | Grade 6.18 6.01
Risk Grade One To Eight [Member] | Commercial and Industrial Total Energy Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Year One, Originated, Current Fiscal Year $ 279,051  
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 125,435  
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 7,519  
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 8,444  
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 4,068  
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 5,665  
Financing Receivable, Revolving 509,657  
Loans and Leases Receivable, Net of Deferred Income $ 999,263 $ 1,008,370
Weighted Average Risk Grade For Loans | Grade 5.71 5.78
Risk Grade One To Eight [Member] | Commercial Real Estate Buildings Land And Other Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Year One, Originated, Current Fiscal Year $ 607,883  
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 1,554,611  
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 1,113,230  
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 809,206  
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 498,477  
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 1,057,840  
Financing Receivable, Revolving 72,704  
Loans and Leases Receivable, Net of Deferred Income $ 5,810,875 $ 5,574,922
Weighted Average Risk Grade For Loans | Grade 6.89 6.91
Risk Grade One To Eight [Member] | Construction Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Year One, Originated, Current Fiscal Year $ 202,413  
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 634,897  
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 195,127  
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 141,510  
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 636  
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 1,842  
Financing Receivable, Revolving 207,182  
Loans and Leases Receivable, Net of Deferred Income $ 1,387,273 $ 1,262,200
Weighted Average Risk Grade For Loans | Grade 6.96 6.99
Risk Grade One To Eight [Member] | Commercial Real Estate Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Net of Deferred Income   $ 6,837,122
Weighted Average Risk Grade For Loans | Grade   6.92
Risk Grade Nine [Member] | Commercial Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Year One, Originated, Current Fiscal Year $ 4,702  
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 34,513  
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 6,562  
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 11,434  
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 21,841  
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 8,319  
Financing Receivable, Revolving 54,008  
Loans and Leases Receivable, Net of Deferred Income $ 146,100 $ 187,870
Weighted Average Risk Grade For Loans | Grade 9.00 9.00
Risk Grade Nine [Member] | Commercial and Industrial Total Energy Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Year One, Originated, Current Fiscal Year $ 1,425  
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 103  
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 508  
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 1,407  
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 96  
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 0  
Financing Receivable, Revolving 5,668  
Loans and Leases Receivable, Net of Deferred Income $ 9,250 $ 36,622
Weighted Average Risk Grade For Loans | Grade 9.00 9.00
Risk Grade Nine [Member] | Commercial Real Estate Buildings Land And Other Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Year One, Originated, Current Fiscal Year $ 6,163  
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 20,766  
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 108,943  
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 53,448  
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 23,459  
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 45,034  
Financing Receivable, Revolving 5,516  
Loans and Leases Receivable, Net of Deferred Income $ 265,947 $ 321,533
Weighted Average Risk Grade For Loans | Grade 9.00 9.00
Risk Grade Nine [Member] | Construction Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Year One, Originated, Current Fiscal Year $ 171  
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 28,069  
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 5,359  
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 0  
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 0  
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 423  
Financing Receivable, Revolving 0  
Loans and Leases Receivable, Net of Deferred Income $ 34,022 $ 41,123
Weighted Average Risk Grade For Loans | Grade 9.00 9.00
Risk Grade Nine [Member] | Commercial Real Estate Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Net of Deferred Income   $ 362,656
Weighted Average Risk Grade For Loans | Grade   9.00
Risk Grade Ten [Member] | Commercial Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Year One, Originated, Current Fiscal Year $ 3,500  
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 22,084  
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 6,527  
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 1,039  
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 4,007  
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 578  
Financing Receivable, Revolving 13,899  
Loans and Leases Receivable, Net of Deferred Income $ 52,832 $ 59,137
Weighted Average Risk Grade For Loans | Grade 10.00 10.00
Risk Grade Ten [Member] | Commercial and Industrial Total Energy Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Year One, Originated, Current Fiscal Year $ 0  
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 0  
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 90  
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 580  
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 351  
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 0  
Financing Receivable, Revolving 0  
Loans and Leases Receivable, Net of Deferred Income $ 1,536 $ 1,773
Weighted Average Risk Grade For Loans | Grade 10.00 10.00
Risk Grade Ten [Member] | Commercial Real Estate Buildings Land And Other Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Year One, Originated, Current Fiscal Year $ 46,125  
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 22,716  
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 7,310  
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 66,821  
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 24,539  
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 57,602  
Financing Receivable, Revolving 0  
Loans and Leases Receivable, Net of Deferred Income $ 225,113 $ 269,447
Weighted Average Risk Grade For Loans | Grade 10.00 10.00
Risk Grade Ten [Member] | Construction Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Year One, Originated, Current Fiscal Year $ 0  
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 0  
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 0  
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 0  
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 0  
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 0  
Financing Receivable, Revolving 0  
Loans and Leases Receivable, Net of Deferred Income $ 0 $ 0
Weighted Average Risk Grade For Loans | Grade 10.00 10.00
Risk Grade Ten [Member] | Commercial Real Estate Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Net of Deferred Income   $ 269,447
Weighted Average Risk Grade For Loans | Grade   10.00
Risk Grade Eleven [Member] | Commercial Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Year One, Originated, Current Fiscal Year $ 0  
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 1,926  
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 6,672  
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 9,679  
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 1,697  
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 2,200  
Financing Receivable, Revolving 5,958  
Loans and Leases Receivable, Net of Deferred Income $ 34,083 $ 31,518
Weighted Average Risk Grade For Loans | Grade 11.00 11.00
Risk Grade Eleven [Member] | Commercial and Industrial Total Energy Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Year One, Originated, Current Fiscal Year $ 9,097  
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 265  
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 512  
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 3,256  
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 951  
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 178  
Financing Receivable, Revolving 0  
Loans and Leases Receivable, Net of Deferred Income $ 14,259 $ 16,594
Weighted Average Risk Grade For Loans | Grade 11.00 11.00
Risk Grade Eleven [Member] | Commercial Real Estate Buildings Land And Other Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Year One, Originated, Current Fiscal Year $ 0  
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 260  
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 1,293  
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 7,328  
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 6,788  
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 36,699  
Financing Receivable, Revolving 3,215  
Loans and Leases Receivable, Net of Deferred Income $ 55,583 $ 91,140
Weighted Average Risk Grade For Loans | Grade 11.00 11.00
Risk Grade Eleven [Member] | Construction Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Year One, Originated, Current Fiscal Year $ 0  
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 0  
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 0  
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 0  
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 0  
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 0  
Financing Receivable, Revolving 0  
Loans and Leases Receivable, Net of Deferred Income $ 0 $ 0
Weighted Average Risk Grade For Loans | Grade 11.00 11.00
Risk Grade Eleven [Member] | Commercial Real Estate Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Net of Deferred Income   $ 91,140
Weighted Average Risk Grade For Loans | Grade   11.00
Risk Grade Twelve [Member] | Commercial Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Year One, Originated, Current Fiscal Year $ 0  
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 478  
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 2,644  
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 3,510  
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 1,488  
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 619  
Financing Receivable, Revolving 941  
Loans and Leases Receivable, Net of Deferred Income $ 11,695 $ 12,535
Weighted Average Risk Grade For Loans | Grade 12.00 12.00
Risk Grade Twelve [Member] | Commercial and Industrial Total Energy Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Year One, Originated, Current Fiscal Year $ 0  
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 0  
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 0  
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 3,708  
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 58  
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 0  
Financing Receivable, Revolving 3,215  
Loans and Leases Receivable, Net of Deferred Income $ 7,079 $ 8,953
Weighted Average Risk Grade For Loans | Grade 12.00 12.00
Risk Grade Twelve [Member] | Commercial Real Estate Buildings Land And Other Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Year One, Originated, Current Fiscal Year $ 0  
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 8,081  
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 296  
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 1,199  
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 394  
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 2,932  
Financing Receivable, Revolving 0  
Loans and Leases Receivable, Net of Deferred Income $ 18,677 $ 15,097
Weighted Average Risk Grade For Loans | Grade 12.00 12.00
Risk Grade Twelve [Member] | Construction Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Year One, Originated, Current Fiscal Year $ 0  
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 0  
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 583  
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 0  
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 0  
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 0  
Financing Receivable, Revolving 0  
Loans and Leases Receivable, Net of Deferred Income $ 583 $ 748
Weighted Average Risk Grade For Loans | Grade 12.00 12.00
Risk Grade Twelve [Member] | Commercial Real Estate Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Net of Deferred Income   $ 15,845
Weighted Average Risk Grade For Loans | Grade   12.00
Risk Grade Thirteen [Member] | Commercial Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Year One, Originated, Current Fiscal Year $ 0  
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 0  
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 1,457  
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 400  
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 64  
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 414  
Financing Receivable, Revolving 1,097  
Loans and Leases Receivable, Net of Deferred Income $ 4,998 $ 10,047
Weighted Average Risk Grade For Loans | Grade 13.00 13.00
Risk Grade Thirteen [Member] | Commercial and Industrial Total Energy Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Year One, Originated, Current Fiscal Year $ 0  
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 0  
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 0  
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 1,331  
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 1,079  
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 0  
Financing Receivable, Revolving 2,782  
Loans and Leases Receivable, Net of Deferred Income $ 5,192 $ 5,480
Weighted Average Risk Grade For Loans | Grade 13.00 13.00
Risk Grade Thirteen [Member] | Commercial Real Estate Buildings Land And Other Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Year One, Originated, Current Fiscal Year $ 0  
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 326  
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 0  
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 0  
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 0  
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 0  
Financing Receivable, Revolving 0  
Loans and Leases Receivable, Net of Deferred Income $ 326 $ 200
Weighted Average Risk Grade For Loans | Grade 13.00 13.00
Risk Grade Thirteen [Member] | Construction Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Year One, Originated, Current Fiscal Year $ 0  
Financing Receivable, Year Two, Originated, Fiscal Year before Current Fiscal Year 0  
Financing Receivable, Year Three, Originated, Two Years before Current Fiscal Year 0  
Financing Receivable, Year Four, Originated, Three Years before Current Fiscal Year 0  
Financing Receivable, Year Five, Originated, Four Years before Current Fiscal Year 0  
Financing Receivable, Originated, More than Five Years before Current Fiscal Year 0  
Financing Receivable, Revolving 0  
Loans and Leases Receivable, Net of Deferred Income $ 0 $ 200
Weighted Average Risk Grade For Loans | Grade 13.00 13.00
Risk Grade Thirteen [Member] | Commercial Real Estate Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Net of Deferred Income   $ 400
Weighted Average Risk Grade For Loans | Grade   13.00
Revolving Credit Facility [Member] | Commercial Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Weighted Average Risk Grade For Loans | Grade 6.14  
Revolving Credit Facility [Member] | Commercial and Industrial Total Energy Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Weighted Average Risk Grade For Loans | Grade 5.41  
Revolving Credit Facility [Member] | Commercial Real Estate Buildings Land And Other Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Weighted Average Risk Grade For Loans | Grade 7.06  
Revolving Credit Facility [Member] | Construction Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Weighted Average Risk Grade For Loans | Grade 6.28  
Revolving Credit Facility [Member] | Commercial Real Estate Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Weighted Average Risk Grade For Loans | Grade 6.50  
Revolving Loans Converted to Term [Member] | Commercial Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Revolving, Converted to Term Loan $ 60,229  
Weighted Average Risk Grade For Loans | Grade 7.82  
Revolving Loans Converted to Term [Member] | Commercial and Industrial Total Energy Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Revolving, Converted to Term Loan $ 60,080  
Weighted Average Risk Grade For Loans | Grade 6.31  
Revolving Loans Converted to Term [Member] | Commercial Real Estate Buildings Land And Other Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Revolving, Converted to Term Loan $ 105,317  
Weighted Average Risk Grade For Loans | Grade 6.99  
Revolving Loans Converted to Term [Member] | Construction Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Revolving, Converted to Term Loan $ 3,666  
Weighted Average Risk Grade For Loans | Grade 8.00  
Revolving Loans Converted to Term [Member] | Commercial Real Estate Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Revolving, Converted to Term Loan $ 108,983  
Weighted Average Risk Grade For Loans | Grade 7.03  
Revolving Loans Converted to Term [Member] | Risk Grade One To Eight [Member] | Commercial Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Revolving, Converted to Term Loan $ 44,778  
Revolving Loans Converted to Term [Member] | Risk Grade One To Eight [Member] | Commercial and Industrial Total Energy Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Revolving, Converted to Term Loan 59,424  
Revolving Loans Converted to Term [Member] | Risk Grade One To Eight [Member] | Commercial Real Estate Buildings Land And Other Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Revolving, Converted to Term Loan 96,924  
Revolving Loans Converted to Term [Member] | Risk Grade One To Eight [Member] | Construction Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Revolving, Converted to Term Loan 3,666  
Revolving Loans Converted to Term [Member] | Risk Grade Nine [Member] | Commercial Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Revolving, Converted to Term Loan 4,721  
Revolving Loans Converted to Term [Member] | Risk Grade Nine [Member] | Commercial and Industrial Total Energy Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Revolving, Converted to Term Loan 43  
Revolving Loans Converted to Term [Member] | Risk Grade Nine [Member] | Commercial Real Estate Buildings Land And Other Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Revolving, Converted to Term Loan 2,618  
Revolving Loans Converted to Term [Member] | Risk Grade Nine [Member] | Construction Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Revolving, Converted to Term Loan 0  
Revolving Loans Converted to Term [Member] | Risk Grade Ten [Member] | Commercial Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Revolving, Converted to Term Loan 1,198  
Revolving Loans Converted to Term [Member] | Risk Grade Ten [Member] | Commercial and Industrial Total Energy Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Revolving, Converted to Term Loan 515  
Revolving Loans Converted to Term [Member] | Risk Grade Ten [Member] | Commercial Real Estate Buildings Land And Other Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Revolving, Converted to Term Loan 0  
Revolving Loans Converted to Term [Member] | Risk Grade Ten [Member] | Construction Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Revolving, Converted to Term Loan 0  
Revolving Loans Converted to Term [Member] | Risk Grade Eleven [Member] | Commercial Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Revolving, Converted to Term Loan 5,951  
Revolving Loans Converted to Term [Member] | Risk Grade Eleven [Member] | Commercial and Industrial Total Energy Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Revolving, Converted to Term Loan 0  
Revolving Loans Converted to Term [Member] | Risk Grade Eleven [Member] | Commercial Real Estate Buildings Land And Other Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Revolving, Converted to Term Loan 0  
Revolving Loans Converted to Term [Member] | Risk Grade Eleven [Member] | Construction Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Revolving, Converted to Term Loan 0  
Revolving Loans Converted to Term [Member] | Risk Grade Twelve [Member] | Commercial Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Revolving, Converted to Term Loan 2,015  
Revolving Loans Converted to Term [Member] | Risk Grade Twelve [Member] | Commercial and Industrial Total Energy Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Revolving, Converted to Term Loan 98  
Revolving Loans Converted to Term [Member] | Risk Grade Twelve [Member] | Commercial Real Estate Buildings Land And Other Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Revolving, Converted to Term Loan 5,775  
Revolving Loans Converted to Term [Member] | Risk Grade Twelve [Member] | Construction Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Revolving, Converted to Term Loan 0  
Revolving Loans Converted to Term [Member] | Risk Grade Thirteen [Member] | Commercial Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Revolving, Converted to Term Loan 1,566  
Revolving Loans Converted to Term [Member] | Risk Grade Thirteen [Member] | Commercial and Industrial Total Energy Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Revolving, Converted to Term Loan 0  
Revolving Loans Converted to Term [Member] | Risk Grade Thirteen [Member] | Commercial Real Estate Buildings Land And Other Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Revolving, Converted to Term Loan 0  
Revolving Loans Converted to Term [Member] | Risk Grade Thirteen [Member] | Construction Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Financing Receivable, Revolving, Converted to Term Loan $ 0  
2022 [Member] | Commercial Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Weighted Average Risk Grade For Loans | Grade 6.16  
2022 [Member] | Commercial and Industrial Total Energy Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Weighted Average Risk Grade For Loans | Grade 6.36  
2022 [Member] | Commercial Real Estate Buildings Land And Other Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Weighted Average Risk Grade For Loans | Grade 7.08  
2022 [Member] | Construction Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Weighted Average Risk Grade For Loans | Grade 6.83  
2022 [Member] | Commercial Real Estate Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Weighted Average Risk Grade For Loans | Grade 7.02  
2021 [Member] | Commercial Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Weighted Average Risk Grade For Loans | Grade 6.87  
2021 [Member] | Commercial and Industrial Total Energy Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Weighted Average Risk Grade For Loans | Grade 5.77  
2021 [Member] | Commercial Real Estate Buildings Land And Other Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Weighted Average Risk Grade For Loans | Grade 7.22  
2021 [Member] | Construction Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Weighted Average Risk Grade For Loans | Grade 7.28  
2021 [Member] | Commercial Real Estate Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Weighted Average Risk Grade For Loans | Grade 7.24  
2020 [Member] | Commercial Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Weighted Average Risk Grade For Loans | Grade 6.17  
2020 [Member] | Commercial and Industrial Total Energy Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Weighted Average Risk Grade For Loans | Grade 7.73  
2020 [Member] | Commercial Real Estate Buildings Land And Other Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Weighted Average Risk Grade For Loans | Grade 7.04  
2020 [Member] | Construction Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Weighted Average Risk Grade For Loans | Grade 6.38  
2020 [Member] | Commercial Real Estate Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Weighted Average Risk Grade For Loans | Grade 6.95  
2019 [Member] | Commercial Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Weighted Average Risk Grade For Loans | Grade 6.75  
2019 [Member] | Commercial and Industrial Total Energy Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Weighted Average Risk Grade For Loans | Grade 9.34  
2019 [Member] | Commercial Real Estate Buildings Land And Other Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Weighted Average Risk Grade For Loans | Grade 7.32  
2019 [Member] | Construction Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Weighted Average Risk Grade For Loans | Grade 7.98  
2019 [Member] | Commercial Real Estate Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Weighted Average Risk Grade For Loans | Grade 7.41  
2018 [Member] | Commercial Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Weighted Average Risk Grade For Loans | Grade 7.00  
2018 [Member] | Commercial and Industrial Total Energy Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Weighted Average Risk Grade For Loans | Grade 9.24  
2018 [Member] | Commercial Real Estate Buildings Land And Other Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Weighted Average Risk Grade For Loans | Grade 7.27  
2018 [Member] | Construction Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Weighted Average Risk Grade For Loans | Grade 6.22  
2018 [Member] | Commercial Real Estate Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Weighted Average Risk Grade For Loans | Grade 7.27  
Prior Years [Member] | Commercial Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Weighted Average Risk Grade For Loans | Grade 5.80  
Prior Years [Member] | Commercial and Industrial Total Energy Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Weighted Average Risk Grade For Loans | Grade 7.16  
Prior Years [Member] | Commercial Real Estate Buildings Land And Other Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Weighted Average Risk Grade For Loans | Grade 6.97  
Prior Years [Member] | Construction Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Weighted Average Risk Grade For Loans | Grade 7.17  
Prior Years [Member] | Commercial Real Estate Portfolio Segment [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Weighted Average Risk Grade For Loans | Grade 6.97