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Allowance for Credit Losses on Loans - Activity in Allowance for Losses Disaggregated on Basis of Impairment (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 01, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Schedule of allowance for loan losses on the basis of impairment method |  |  |  |  |  |  |  |
Balance at the beginning of the year | $ 36,171 |  |  |  | $ 35,042 | $ 36,171 | $ 35,042 | $ 32,086
Charge-offs |  |  |  |  |  | (5,622) | (4,989) | (3,605)
Recoveries |  |  |  |  |  | 2,381 | 1,807 | 1,432
Provision for credit losses |  | $ 1,558 | $ 466 | $ 1,367 | 920 | 35,433 | 4,311 | 5,129
Balance at the end of the year |  | 36,171 |  |  |  | 70,185 | 36,171 | 35,042
Allowance for credit losses on loans | 37,993 | 36,171 |  |  |  | 70,185 | 36,171 |
Financing Receivable, Individually Evaluated for Impairment |  | 57,481 |  |  |  |  | 57,481 |
Loans Collectively Evaluated for Impairment |  | 3,692,288 |  |  |  |  | 3,692,288 |
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Carrying Amount |  | 18,110 |  |  |  |  | 18,110 |
Loans and Leases Receivable, Gross |  | 3,767,879 |  |  |  | 4,468,647 | 3,767,879 |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment |  | 2,143 |  |  |  |  | 2,143 |
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment |  | 31,759 |  |  |  |  | 31,759 |
Certain Loans and Debt Securities Acquired in Transfer, Allowance for Credit Losses Due to Subsequent Impairment |  | 2,269 |  |  |  |  | 2,269 |
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |  |  |
Schedule of allowance for loan losses on the basis of impairment method |  |  |  |  |  |  |  |
Balance at the beginning of the year | 1,822 |  |  |  | 0 | 1,822 | 0 | 0
Balance at the end of the year |  | 1,822 |  |  |  |  | 1,822 | 0
Cumulative Effect, Period of Adoption, Adjusted Balance |  |  |  |  |  |  |  |
Schedule of allowance for loan losses on the basis of impairment method |  |  |  |  |  |  |  |
Balance at the beginning of the year | 37,993 |  |  |  | 35,042 | 37,993 | 35,042 | 32,086
Balance at the end of the year |  | 37,993 |  |  |  |  | 37,993 | 35,042
Accounting Standards Update 2016-13 [Member] |  |  |  |  |  |  |  |
Schedule of allowance for loan losses on the basis of impairment method |  |  |  |  |  |  |  |
Impact of CECL Adoption | 5,600 |  |  |  |  |  |  |
Allowance for credit losses on loans | 1,800 |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses, Effect of Change in Method | 1,822 |  |  |  |  |  |  |
Commercial business |  |  |  |  |  |  |  |
Schedule of allowance for loan losses on the basis of impairment method |  |  |  |  |  |  |  |
Balance at the beginning of the year | 23,933 |  |  |  | 23,711 | 23,933 | 23,711 | 21,999
Charge-offs |  |  |  |  |  | (3,751) | (2,692) | (1,400)
Recoveries |  |  |  |  |  | 1,530 | 657 | 908
Provision for credit losses |  |  |  |  |  | 30,831 | 2,257 | 2,204
Balance at the end of the year |  | 23,933 |  |  |  | 49,608 | 23,933 | 23,711
Allowance for credit losses on loans | 20,998 |  |  |  |  |  |  |
Financing Receivable, Individually Evaluated for Impairment |  | 56,468 |  |  |  |  | 56,468 |
Loans Collectively Evaluated for Impairment |  | 2,876,992 |  |  |  |  | 2,876,992 |
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Carrying Amount |  | 12,773 |  |  |  |  | 12,773 |
Loans and Leases Receivable, Gross |  | 2,946,233 |  |  |  | 3,715,206 | 2,946,233 |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment |  | 1,944 |  |  |  |  | 1,944 |
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment |  | 20,394 |  |  |  |  | 20,394 |
Certain Loans and Debt Securities Acquired in Transfer, Allowance for Credit Losses Due to Subsequent Impairment |  | 1,595 |  |  |  |  | 1,595 |
Commercial business | Accounting Standards Update 2016-13 [Member] |  |  |  |  |  |  |  |
Schedule of allowance for loan losses on the basis of impairment method |  |  |  |  |  |  |  |
Impact of CECL Adoption | (2,935) |  |  |  |  |  |  |
Commercial business | Commercial and industrial |  |  |  |  |  |  |  |
Schedule of allowance for loan losses on the basis of impairment method |  |  |  |  |  |  |  |
Balance at the beginning of the year | 11,739 |  |  |  | 11,343 | 11,739 | 11,343 | 9,910
Charge-offs |  |  |  |  |  |  | (2,692) | (1,250)
Recoveries |  |  |  |  |  |  | 166 | 901
Provision for credit losses |  |  |  |  |  | 21,722 | 2,922 | 1,782
Balance at the end of the year |  | 11,739 |  |  |  | 30,010 | 11,739 | 11,343
Allowance for credit losses on loans | 10,391 |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Writeoff |  |  |  |  |  | (3,616) |  |
Financing Receivable, Allowance for Credit Loss, Recovery |  |  |  |  |  | 1,513 |  |
Financing Receivable, Individually Evaluated for Impairment |  | 43,808 |  |  |  |  | 43,808 |
Loans Collectively Evaluated for Impairment |  | 806,044 |  |  |  |  | 806,044 |
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Carrying Amount |  | 2,368 |  |  |  |  | 2,368 |
Loans and Leases Receivable, Gross |  | 852,220 |  |  |  |  | 852,220 |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment |  | 1,372 |  |  |  |  | 1,372 |
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment |  | 9,772 |  |  |  |  | 9,772 |
Certain Loans and Debt Securities Acquired in Transfer, Allowance for Credit Losses Due to Subsequent Impairment |  | 595 |  |  |  |  | 595 |
Commercial business | Commercial and industrial | Accounting Standards Update 2016-13 [Member] |  |  |  |  |  |  |  |
Schedule of allowance for loan losses on the basis of impairment method |  |  |  |  |  |  |  |
Impact of CECL Adoption | (1,348) |  |  |  |  |  |  |
Commercial business | Owner-occupied CRE |  |  |  |  |  |  |  |
Schedule of allowance for loan losses on the basis of impairment method |  |  |  |  |  |  |  |
Balance at the beginning of the year | 4,512 |  |  |  | 4,898 | 4,512 | 4,898 | 3,992
Charge-offs |  |  |  |  |  |  | 0 | (1)
Recoveries |  |  |  |  |  |  | 50 | 7
Provision for credit losses |  |  |  |  |  | 4,640 | (436) | 900
Balance at the end of the year |  | 4,512 |  |  |  | 9,486 | 4,512 | 4,898
Allowance for credit losses on loans | 4,964 |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Writeoff |  |  |  |  |  | (135) |  |
Financing Receivable, Allowance for Credit Loss, Recovery |  |  |  |  |  | 17 |  |
Financing Receivable, Individually Evaluated for Impairment |  | 6,336 |  |  |  |  | 6,336 |
Loans Collectively Evaluated for Impairment |  | 793,984 |  |  |  |  | 793,984 |
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Carrying Amount |  | 4,914 |  |  |  |  | 4,914 |
Loans and Leases Receivable, Gross |  | 805,234 |  |  |  |  | 805,234 |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment |  | 426 |  |  |  |  | 426 |
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment |  | 3,558 |  |  |  |  | 3,558 |
Certain Loans and Debt Securities Acquired in Transfer, Allowance for Credit Losses Due to Subsequent Impairment |  | 528 |  |  |  |  | 528 |
Commercial business | Owner-occupied CRE | Accounting Standards Update 2016-13 [Member] |  |  |  |  |  |  |  |
Schedule of allowance for loan losses on the basis of impairment method |  |  |  |  |  |  |  |
Impact of CECL Adoption | 452 |  |  |  |  |  |  |
Commercial business | Non-owner occupied CRE |  |  |  |  |  |  |  |
Schedule of allowance for loan losses on the basis of impairment method |  |  |  |  |  |  |  |
Balance at the beginning of the year | 7,682 |  |  |  | 7,470 | 7,682 | 7,470 | 8,097
Charge-offs |  |  |  |  |  |  | 0 | (149)
Recoveries |  |  |  |  |  |  | 441 | 0
Provision for credit losses |  |  |  |  |  | 4,469 | (229) | (478)
Balance at the end of the year |  | 7,682 |  |  |  | 10,112 | 7,682 | 7,470
Allowance for credit losses on loans | 5,643 |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Writeoff |  |  |  |  |  | 0 |  |
Financing Receivable, Allowance for Credit Loss, Recovery |  |  |  |  |  | 0 |  |
Financing Receivable, Individually Evaluated for Impairment |  | 6,324 |  |  |  |  | 6,324 |
Loans Collectively Evaluated for Impairment |  | 1,276,964 |  |  |  |  | 1,276,964 |
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Carrying Amount |  | 5,491 |  |  |  |  | 5,491 |
Loans and Leases Receivable, Gross |  | 1,288,779 |  |  |  |  | 1,288,779 |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment |  | 146 |  |  |  |  | 146 |
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment |  | 7,064 |  |  |  |  | 7,064 |
Certain Loans and Debt Securities Acquired in Transfer, Allowance for Credit Losses Due to Subsequent Impairment |  | 472 |  |  |  |  | 472 |
Commercial business | Non-owner occupied CRE | Accounting Standards Update 2016-13 [Member] |  |  |  |  |  |  |  |
Schedule of allowance for loan losses on the basis of impairment method |  |  |  |  |  |  |  |
Impact of CECL Adoption | (2,039) |  |  |  |  |  |  |
Commercial business | Paycheck Protection Program [Member] |  |  |  |  |  |  |  |
Schedule of allowance for loan losses on the basis of impairment method |  |  |  |  |  |  |  |
Balance at the beginning of the year | 0 |  |  |  |  | 0 |  |
Provision for credit losses |  |  |  |  |  | 0 |  |
Balance at the end of the year |  | 0 |  |  |  | 0 | 0 |
Allowance for credit losses on loans | 0 |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Writeoff |  |  |  |  |  | 0 |  |
Financing Receivable, Allowance for Credit Loss, Recovery |  |  |  |  |  | 0 |  |
Commercial business | Paycheck Protection Program [Member] | Accounting Standards Update 2016-13 [Member] |  |  |  |  |  |  |  |
Schedule of allowance for loan losses on the basis of impairment method |  |  |  |  |  |  |  |
Impact of CECL Adoption | 0 |  |  |  |  |  |  |
Residential real estate |  |  |  |  |  |  |  |
Schedule of allowance for loan losses on the basis of impairment method |  |  |  |  |  |  |  |
Balance at the beginning of the year | 1,458 |  |  |  | 1,203 | 1,458 | 1,203 | 1,056
Charge-offs |  |  |  |  |  |  | (60) | (45)
Recoveries |  |  |  |  |  |  | 0 | 0
Provision for credit losses |  |  |  |  |  | (1,341) | 315 | 192
Balance at the end of the year |  | 1,458 |  |  |  | 1,591 | 1,458 | 1,203
Allowance for credit losses on loans | 2,929 |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Writeoff |  |  |  |  |  | 0 |  |
Financing Receivable, Allowance for Credit Loss, Recovery |  |  |  |  |  | 3 |  |
Financing Receivable, Individually Evaluated for Impairment |  | 215 |  |  |  |  | 215 |
Loans Collectively Evaluated for Impairment |  | 127,870 |  |  |  |  | 127,870 |
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Carrying Amount |  | 3,575 |  |  |  |  | 3,575 |
Loans and Leases Receivable, Gross |  | 131,660 |  |  |  |  | 131,660 |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment |  | 56 |  |  |  |  | 56 |
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment |  | 1,316 |  |  |  |  | 1,316 |
Certain Loans and Debt Securities Acquired in Transfer, Allowance for Credit Losses Due to Subsequent Impairment |  | 86 |  |  |  |  | 86 |
Residential real estate | Accounting Standards Update 2016-13 [Member] |  |  |  |  |  |  |  |
Schedule of allowance for loan losses on the basis of impairment method |  |  |  |  |  |  |  |
Impact of CECL Adoption | 1,471 |  |  |  |  |  |  |
Real estate construction and land development |  |  |  |  |  |  |  |
Schedule of allowance for loan losses on the basis of impairment method |  |  |  |  |  |  |  |
Balance at the beginning of the year | 3,060 |  |  |  | 2,194 | 3,060 | 2,194 | 2,052
Charge-offs |  |  |  |  |  | (417) | (133) | 0
Recoveries |  |  |  |  |  | 278 | 637 | 11
Provision for credit losses |  |  |  |  |  | 3,502 | 362 | 131
Balance at the end of the year |  | 3,060 |  |  |  | 13,092 | 3,060 | 2,194
Allowance for credit losses on loans | 9,729 |  |  |  |  |  |  |
Financing Receivable, Individually Evaluated for Impairment |  | 237 |  |  |  |  | 237 |
Loans Collectively Evaluated for Impairment |  | 274,409 |  |  |  |  | 274,409 |
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Carrying Amount |  | 0 |  |  |  |  | 0 |
Loans and Leases Receivable, Gross |  | 274,646 |  |  |  | 305,713 | 274,646 |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment |  | 0 |  |  |  |  | 0 |
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment |  | 2,823 |  |  |  |  | 2,823 |
Certain Loans and Debt Securities Acquired in Transfer, Allowance for Credit Losses Due to Subsequent Impairment |  | 237 |  |  |  |  | 237 |
Real estate construction and land development | Accounting Standards Update 2016-13 [Member] |  |  |  |  |  |  |  |
Schedule of allowance for loan losses on the basis of impairment method |  |  |  |  |  |  |  |
Impact of CECL Adoption | 6,669 |  |  |  |  |  |  |
Real estate construction and land development | Residential |  |  |  |  |  |  |  |
Schedule of allowance for loan losses on the basis of impairment method |  |  |  |  |  |  |  |
Balance at the beginning of the year | 1,455 |  |  |  | 1,240 | 1,455 | 1,240 | 862
Charge-offs |  |  |  |  |  |  | (133) | 0
Recoveries |  |  |  |  |  |  | 637 | 11
Provision for credit losses |  |  |  |  |  | 789 | (289) | 367
Balance at the end of the year |  | 1,455 |  |  |  | 1,951 | 1,455 | 1,240
Allowance for credit losses on loans | 884 |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Writeoff |  |  |  |  |  | 0 |  |
Financing Receivable, Allowance for Credit Loss, Recovery |  |  |  |  |  | 278 |  |
Financing Receivable, Individually Evaluated for Impairment |  | 237 |  |  |  |  | 237 |
Loans Collectively Evaluated for Impairment |  | 104,059 |  |  |  |  | 104,059 |
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Carrying Amount |  | 0 |  |  |  |  | 0 |
Loans and Leases Receivable, Gross |  | 104,296 |  |  |  |  | 104,296 |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment |  | 0 |  |  |  |  | 0 |
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment |  | 1,296 |  |  |  |  | 1,296 |
Certain Loans and Debt Securities Acquired in Transfer, Allowance for Credit Losses Due to Subsequent Impairment |  | 159 |  |  |  |  | 159 |
Real estate construction and land development | Residential | Accounting Standards Update 2016-13 [Member] |  |  |  |  |  |  |  |
Schedule of allowance for loan losses on the basis of impairment method |  |  |  |  |  |  |  |
Impact of CECL Adoption | (571) |  |  |  |  |  |  |
Real estate construction and land development | Commercial and multifamily |  |  |  |  |  |  |  |
Schedule of allowance for loan losses on the basis of impairment method |  |  |  |  |  |  |  |
Balance at the beginning of the year | 1,605 |  |  |  | 954 | 1,605 | 954 | 1,190
Charge-offs |  |  |  |  |  |  | 0 | 0
Recoveries |  |  |  |  |  |  | 0 | 0
Provision for credit losses |  |  |  |  |  | 2,713 | 651 | (236)
Balance at the end of the year |  | 1,605 |  |  |  | 11,141 | 1,605 | 954
Allowance for credit losses on loans | 8,845 |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Writeoff |  |  |  |  |  | (417) |  |
Financing Receivable, Allowance for Credit Loss, Recovery |  |  |  |  |  | 0 |  |
Financing Receivable, Individually Evaluated for Impairment |  | 0 |  |  |  |  | 0 |
Loans Collectively Evaluated for Impairment |  | 170,350 |  |  |  |  | 170,350 |
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Carrying Amount |  | 0 |  |  |  |  | 0 |
Loans and Leases Receivable, Gross |  | 170,350 |  |  |  |  | 170,350 |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment |  | 0 |  |  |  |  | 0 |
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment |  | 1,527 |  |  |  |  | 1,527 |
Certain Loans and Debt Securities Acquired in Transfer, Allowance for Credit Losses Due to Subsequent Impairment |  | 78 |  |  |  |  | 78 |
Real estate construction and land development | Commercial and multifamily | Accounting Standards Update 2016-13 [Member] |  |  |  |  |  |  |  |
Schedule of allowance for loan losses on the basis of impairment method |  |  |  |  |  |  |  |
Impact of CECL Adoption | 7,240 |  |  |  |  |  |  |
Consumer |  |  |  |  |  |  |  |
Schedule of allowance for loan losses on the basis of impairment method |  |  |  |  |  |  |  |
Balance at the beginning of the year | 6,821 |  |  |  | 6,581 | 6,821 | 6,581 | 6,081
Charge-offs |  |  |  |  |  |  | (2,104) | (2,160)
Recoveries |  |  |  |  |  |  | 513 | 513
Provision for credit losses |  |  |  |  |  | 2,441 | 1,831 | 2,147
Balance at the end of the year |  | 6,821 |  |  |  | 5,894 | 6,821 | 6,581
Allowance for credit losses on loans | 4,337 |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Writeoff |  |  |  |  |  | (1,454) |  |
Financing Receivable, Allowance for Credit Loss, Recovery |  |  |  |  |  | 570 |  |
Financing Receivable, Individually Evaluated for Impairment |  | 561 |  |  |  |  | 561 |
Loans Collectively Evaluated for Impairment |  | 413,017 |  |  |  |  | 413,017 |
Certain Loans Acquired In Transfer Not Accounted For As Debt Securities Carrying Amount |  | 1,762 |  |  |  |  | 1,762 |
Loans and Leases Receivable, Gross |  | 415,340 |  |  |  |  | 415,340 |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment |  | 143 |  |  |  |  | 143 |
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment |  | 6,327 |  |  |  |  | 6,327 |
Certain Loans and Debt Securities Acquired in Transfer, Allowance for Credit Losses Due to Subsequent Impairment |  | 351 |  |  |  |  | 351 |
Consumer | Accounting Standards Update 2016-13 [Member] |  |  |  |  |  |  |  |
Schedule of allowance for loan losses on the basis of impairment method |  |  |  |  |  |  |  |
Impact of CECL Adoption | (2,484) |  |  |  |  |  |  |
Unallocated |  |  |  |  |  |  |  |
Schedule of allowance for loan losses on the basis of impairment method |  |  |  |  |  |  |  |
Balance at the beginning of the year | 899 |  |  |  | $ 1,353 | 899 | 1,353 | 898
Charge-offs |  |  |  |  |  | 0 | 0 | 0
Recoveries |  |  |  |  |  | 0 | 0 | 0
Provision for credit losses |  |  |  |  |  | 0 | (454) | 455
Balance at the end of the year |  | 899 |  |  |  | $ 0 | 899 | $ 1,353
Allowance for credit losses on loans | 0 |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment |  | 899 |  |  |  |  | 899 |
Certain Loans and Debt Securities Acquired in Transfer, Allowance for Credit Losses Due to Subsequent Impairment |  |  |  |  |  |  |  |
Unallocated | Accounting Standards Update 2016-13 [Member] |  |  |  |  |  |  |  |
Schedule of allowance for loan losses on the basis of impairment method |  |  |  |  |  |  |  |
Impact of CECL Adoption | $ (899) |  |  |  |  |  |  |

X
- Definition The recorded balance after any applicable reductions (i.e. outstanding balance net of unamortized accretable yield). This relates to loans not accounted for debt securities with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References No definition available. + Details
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- Definition Cumulative Effects of New Accounting Principle in Period of Adoption + References No definition available. + Details
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- Definition Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts. + 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)(4) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss. + 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)(3) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 + Details
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