Loans and Allowance for Credit Losses - Changes in Allowance for Credit Losses by Class of Financing Receivable (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	$ 120,049	$ 157,954	$ 125,559	$ 170,389
Provision for credit losses	8,181	(12,885)	2,052	(24,517)
Recoveries of loans previously charged-off	430	453	1,628	820
Loans charged off	(2,388)	(859)	(2,967)	(2,029)
Balance at end of period	126,272	144,663	126,272	144,663
Commercial and industrial
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	12,699	14,643	15,751	14,748
Provision for credit losses	(783)	(579)	(4,789)	(536)
Recoveries of loans previously charged-off	26	87	984	216
Loans charged off	(1,751)	(360)	(1,755)	(637)
Balance at end of period	10,191	13,791	10,191	13,791
Construction
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	31,782	38,622	28,576	58,477
Provision for credit losses	6,590	(5,784)	9,796	(25,610)
Recoveries of loans previously charged-off	11	0	11	0
Loans charged off	0	0	0	(29)
Balance at end of period	38,383	32,838	38,383	32,838
Residential real estate: | 1-to-4 family mortgage
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	21,024	19,572	19,104	19,220
Provision for credit losses	383	75	2,291	536
Recoveries of loans previously charged-off	14	41	26	65
Loans charged off	(23)	(16)	(23)	(149)
Balance at end of period	21,398	19,672	21,398	19,672
Residential real estate: | Residential line of credit
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	6,545	9,268	5,903	10,534
Provision for credit losses	314	(2,558)	955	(3,815)
Recoveries of loans previously charged-off	16	9	17	15
Loans charged off	0	(3)	0	(18)
Balance at end of period	6,875	6,716	6,875	6,716
Residential real estate: | Multi-family mortgage
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	6,398	11,657	6,976	7,174
Provision for credit losses	105	1,818	(473)	6,301
Recoveries of loans previously charged-off	0	0	0	0
Loans charged off	0	0	0	0
Balance at end of period	6,503	13,475	6,503	13,475
Commercial real estate: | Owner occupied
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	8,416	3,609	12,593	4,849
Provision for credit losses	(1,102)	972	(5,289)	(281)
Recoveries of loans previously charged-off	15	126	25	139
Loans charged off	0	0	0	0
Balance at end of period	7,329	4,707	7,329	4,707
Commercial real estate: | Non-owner occupied
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	21,290	50,179	25,768	44,147
Provision for credit losses	1,246	(7,323)	(3,232)	(1,291)
Recoveries of loans previously charged-off	0	0	0	0
Loans charged off	0	0	0	0
Balance at end of period	22,536	42,856	22,536	42,856
Consumer and other
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	11,895	10,404	10,888	11,240
Provision for credit losses	1,428	494	2,793	179
Recoveries of loans previously charged-off	348	190	565	385
Loans charged off	(614)	(480)	(1,189)	(1,196)
Balance at end of period	$ 13,057	$ 10,608	$ 13,057	$ 10,608