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Loans and Allowance for Loan Losses - Activity in the Allowance for Loan Losses, by Portfolio Segment, for the Current Year (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Balance, beginning of period | $ 64,179,000 | $ 53,776,000 | $ 56,694,000 | $ 42,086,000 |
Provision for loan losses | 21,973,000 | 10,345,000 | 38,337,000 | 28,528,000 |
Balance, end of year | 66,590,000 | 56,703,000 | 66,590,000 | 56,703,000 |
Loans, Excluding Acquired Loans |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Balance, beginning of period | 63,067,000 | 51,732,000 | 56,599,000 | 41,668,000 |
Provision for loan losses | 21,973,000 | 10,345,000 | 35,873,000 | 26,691,000 |
Charge-offs | (20,812,000) | (7,784,000) | (29,911,000) | (15,384,000) |
Recoveries | 1,765,000 | 1,065,000 | 3,432,000 | 2,383,000 |
Net charge-offs | (19,047,000) | (6,719,000) | (26,479,000) | (13,001,000) |
Balance, end of year | 65,993,000 | 55,358,000 | 65,993,000 | 55,358,000 |
Period-end amount allocated to: |  |  |  |  |
Loans individually evaluated for impairment | 5,279,000 | 459,000 | 5,279,000 | 459,000 | $ 684,000
Loans collectively evaluated for impairment | 60,714,000 | 54,899,000 | 60,714,000 | 54,899,000 | 55,915,000
Loans, Excluding Acquired Loans | Other Consumer and Other |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Balance, beginning of period | 2,460,000 | 3,239,000 | 2,419,000 | 3,596,000 |
Provision for loan losses | (528,000) | 729,000 | 1,320,000 | 2,567,000 |
Charge-offs | (1,059,000) | (1,321,000) | (3,497,000) | (3,743,000) |
Recoveries | 1,422,000 | 176,000 | 2,053,000 | 403,000 |
Net charge-offs | 363,000 | (1,145,000) | (1,444,000) | (3,340,000) |
Balance, end of year | 2,295,000 | 2,823,000 | 2,295,000 | 2,823,000 |
Period-end amount allocated to: |  |  |  |  |
Loans individually evaluated for impairment | 0 | 0 | 0 | 0 | 0
Loans collectively evaluated for impairment | 2,295,000 | 2,823,000 | 2,295,000 | 2,823,000 | 2,419,000
Loans, Excluding Acquired Loans | Commercial |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Balance, beginning of period | 21,739,000 | 15,767,000 | 20,514,000 | 7,007,000 |
Provision for loan losses | 19,150,000 | 3,589,000 | 23,980,000 | 14,772,000 |
Charge-offs | (17,729,000) | (592,000) | (21,564,000) | (3,143,000) |
Recoveries | 65,000 | 450,000 | 295,000 | 578,000 |
Net charge-offs | (17,664,000) | (142,000) | (21,269,000) | (2,565,000) |
Balance, end of year | 23,225,000 | 19,214,000 | 23,225,000 | 19,214,000 |
Period-end amount allocated to: |  |  |  |  |
Loans individually evaluated for impairment | 4,620,000 | 191,000 | 4,620,000 | 191,000 | 437,000
Loans collectively evaluated for impairment | 18,605,000 | 19,023,000 | 18,605,000 | 19,023,000 | 20,077,000
Loans, Excluding Acquired Loans | Real Estate |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Balance, beginning of period | 34,917,000 | 28,904,000 | 29,743,000 | 27,281,000 |
Provision for loan losses | 2,405,000 | 5,308,000 | 7,929,000 | 7,133,000 |
Charge-offs | (907,000) | (4,952,000) | (1,552,000) | (5,568,000) |
Recoveries | 55,000 | 210,000 | 350,000 | 624,000 |
Net charge-offs | (852,000) | (4,742,000) | (1,202,000) | (4,944,000) |
Balance, end of year | 36,470,000 | 29,470,000 | 36,470,000 | 29,470,000 |
Period-end amount allocated to: |  |  |  |  |
Loans individually evaluated for impairment | 659,000 | 268,000 | 659,000 | 268,000 | 247,000
Loans collectively evaluated for impairment | 35,811,000 | 29,202,000 | 35,811,000 | 29,202,000 | 29,496,000
Loans, Excluding Acquired Loans | Credit Card | Credit cards |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Balance, beginning of period | 3,951,000 | 3,822,000 | 3,923,000 | 3,784,000 |
Provision for loan losses | 946,000 | 719,000 | 2,644,000 | 2,219,000 |
Charge-offs | (1,117,000) | (919,000) | (3,298,000) | (2,930,000) |
Recoveries | 223,000 | 229,000 | 734,000 | 778,000 |
Net charge-offs | (894,000) | (690,000) | (2,564,000) | (2,152,000) |
Balance, end of year | 4,003,000 | 3,851,000 | 4,003,000 | 3,851,000 |
Period-end amount allocated to: |  |  |  |  |
Loans individually evaluated for impairment | 0 | 0 | 0 | 0 | 0
Loans collectively evaluated for impairment | 4,003,000 | 3,851,000 | 4,003,000 | 3,851,000 | $ 3,923,000
Loans Acquired |  |  |  |  |
Allowance for Loan and Lease Losses [Roll Forward] |  |  |  |  |
Balance, beginning of period | 1,112,000 | 2,044,000 | 95,000 | 418,000 |
Provision for loan losses | 0 | 0 | 2,464,000 | 1,837,000 |
Charge-offs | (515,000) | (699,000) | (2,862,000) | (910,000) |
Recoveries |  |  | 900,000 |  |
Balance, end of year | $ 597,000 | $ 1,345,000 | $ 597,000 | $ 1,345,000 |

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