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Allowance for Credit and Loan Losses - Allowance for Loan Losses (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Financing Receivable, Allowance for Credit Loss    
Balance, beginning of period $ 57,027 $ 17,667
Provision for credit losses on loans 367 8,600
Charge–offs (431) (713)
Recoveries 223 309
Balance, end of period 57,186 48,440
Impact of adopting ASC 326    
Financing Receivable, Allowance for Credit Loss    
Balance, beginning of period   22,577
Mortgage warehouse    
Financing Receivable, Allowance for Credit Loss    
Balance, beginning of period 1,267 1,077
Provision for credit losses on loans (104) (22)
Charge–offs 0 0
Recoveries 0 0
Balance, end of period 1,163 1,055
Mortgage warehouse | Impact of adopting ASC 326    
Financing Receivable, Allowance for Credit Loss    
Balance, beginning of period   0
Commercial    
Financing Receivable, Allowance for Credit Loss    
Balance, beginning of period 42,210 11,996
Provision for credit losses on loans 928 6,916
Charge–offs (196) (69)
Recoveries 38 89
Balance, end of period 42,980 32,550
Commercial | Impact of adopting ASC 326    
Financing Receivable, Allowance for Credit Loss    
Balance, beginning of period   13,618
Real estate    
Financing Receivable, Allowance for Credit Loss    
Balance, beginning of period 4,620 923
Provision for credit losses on loans (456) 700
Charge–offs 0 (26)
Recoveries 65 9
Balance, end of period 4,229 5,654
Real estate | Impact of adopting ASC 326    
Financing Receivable, Allowance for Credit Loss    
Balance, beginning of period   4,048
Consumer    
Financing Receivable, Allowance for Credit Loss    
Balance, beginning of period 8,930 3,671
Provision for credit losses on loans (1) 1,006
Charge–offs (235) (618)
Recoveries 120 211
Balance, end of period $ 8,814 9,181
Consumer | Impact of adopting ASC 326    
Financing Receivable, Allowance for Credit Loss    
Balance, beginning of period   $ 4,911