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Loans and Allowance for Credit Losses - Schedule of Activity in Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period	$ 109,444	$ 128,394	$ 131,388	$ 54,619
Charge-offs	(1,215)	(4,169)	(3,765)	(14,846)
Recoveries	4,252	7,163	7,143	10,773
Provision for credit losses	(4,613)	0	(26,898)	39,495
Balance at End of Period	107,868	131,388	107,868	131,388
Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period				41,347
Cumulative Effect, Period of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period	109,444	128,394	131,388	95,966
Commercial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period	25,731	29,618	30,567	21,359
Charge-offs	(354)	(128)	(940)	(5,303)
Recoveries	106	2,192	549	3,100
Provision for credit losses	677	(3,289)	(4,016)	2,087
Balance at End of Period	26,160	28,393	26,160	28,393
Commercial | Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period				7,150
Commercial | Cumulative Effect, Period of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period	25,731	29,618	30,567	28,509
Commercial real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period	65,469	71,069	75,810	20,535
Charge-offs	(86)	(2,709)	(264)	(5,164)
Recoveries	3,371	3,379	3,555	4,297
Provision for credit losses	(3,657)	4,173	(14,004)	30,696
Balance at End of Period	65,097	75,912	65,097	75,912
Commercial real estate | Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period				25,548
Commercial real estate | Cumulative Effect, Period of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period	65,469	71,069	75,810	46,083
BBCC
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period	2,798	6,332	6,120	2,279
Charge-offs	(8)	(10)	(144)	(92)
Recoveries	31	0	87	122
Provision for credit losses	(259)	15	(3,501)	326
Balance at End of Period	2,562	6,337	2,562	6,337
BBCC | Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period				3,702
BBCC | Cumulative Effect, Period of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period	2,798	6,332	6,120	5,981
Residential real estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period	10,419	14,244	12,608	2,299
Charge-offs	(85)	(321)	(305)	(637)
Recoveries	79	220	217	431
Provision for credit losses	(887)	(219)	(2,994)	4,845
Balance at End of Period	9,526	13,924	9,526	13,924
Residential real estate | Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period				6,986
Residential real estate | Cumulative Effect, Period of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period	10,419	14,244	12,608	9,285
Indirect
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period	2,043	4,453	3,580	5,319
Charge-offs	(113)	(556)	(903)	(2,125)
Recoveries	294	587	1,395	1,494
Provision for credit losses	(363)	(394)	(2,211)	1,071
Balance at End of Period	1,861	4,090	1,861	4,090
Indirect | Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period				(1,669)
Indirect | Cumulative Effect, Period of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period	2,043	4,453	3,580	3,650
Direct
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period	640	835	855	1,863
Charge-offs	(355)	(445)	(913)	(1,326)
Recoveries	153	187	622	571
Provision for credit losses	148	248	22	776
Balance at End of Period	586	825	586	825
Direct | Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period				(1,059)
Direct | Cumulative Effect, Period of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period	640	835	855	804
Home equity
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period	2,344	1,843	1,848	965
Charge-offs	(214)	0	(296)	(199)
Recoveries	218	598	718	758
Provision for credit losses	(272)	(534)	(194)	(306)
Balance at End of Period	2,076	1,907	2,076	1,907
Home equity | Cumulative Effect, Period of Adoption, Adjustment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period				689
Home equity | Cumulative Effect, Period of Adoption, Adjusted Balance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Period	$ 2,344	$ 1,843	$ 1,848	$ 1,654

X

- Definition

Amount excluding accrued interest, of allowance for credit loss on financing receivable.

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