Loans and Allowance for Credit Losses - Changes in Allowance for Credit Losses by Class of Financing Receivable (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	$ 126,272	$ 144,663	$ 125,559	$ 170,389
Provision for credit losses	8,189	(2,832)	10,241	(27,349)
Recoveries of loans previously charged-off	476	229	2,104	1,049
Loans charged off	(461)	(2,614)	(3,428)	(4,643)
Balance at end of period	134,476	139,446	134,476	139,446
Commercial and industrial
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	10,191	13,791	15,751	14,748
Provision for credit losses	5	3,203	(4,784)	2,667
Recoveries of loans previously charged-off	342	19	1,326	235
Loans charged off	0	(2,175)	(1,755)	(2,812)
Balance at end of period	10,538	14,838	10,538	14,838
Construction
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	38,383	32,838	28,576	58,477
Provision for credit losses	3,044	(3,080)	12,840	(28,690)
Recoveries of loans previously charged-off	0	3	11	3
Loans charged off	0	(1)	0	(30)
Balance at end of period	41,427	29,760	41,427	29,760
Residential real estate: | 1-to-4 family mortgage
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	21,398	19,672	19,104	19,220
Provision for credit losses	3,975	(2,677)	6,266	(2,141)
Recoveries of loans previously charged-off	13	33	39	98
Loans charged off	(20)	0	(43)	(149)
Balance at end of period	25,366	17,028	25,366	17,028
Residential real estate: | Residential line of credit
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	6,875	6,716	5,903	10,534
Provision for credit losses	77	(952)	1,032	(4,767)
Recoveries of loans previously charged-off	0	1	17	16
Loans charged off	0	0	0	(18)
Balance at end of period	6,952	5,765	6,952	5,765
Residential real estate: | Multi-family mortgage
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	6,503	13,475	6,976	7,174
Provision for credit losses	(629)	(1,462)	(1,102)	4,839
Recoveries of loans previously charged-off	0	0	0	0
Loans charged off	0	0	0	0
Balance at end of period	5,874	12,013	5,874	12,013
Commercial real estate: | Owner-occupied
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	7,329	4,707	12,593	4,849
Provision for credit losses	688	7,665	(4,601)	7,384
Recoveries of loans previously charged-off	51	4	76	143
Loans charged off	0	0	0	0
Balance at end of period	8,068	12,376	8,068	12,376
Commercial real estate: | Non-owner occupied
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	22,536	42,856	25,768	44,147
Provision for credit losses	247	(6,450)	(2,985)	(7,741)
Recoveries of loans previously charged-off	0	0	0	0
Loans charged off	0	0	0	0
Balance at end of period	22,783	36,406	22,783	36,406
Consumer and other
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	13,057	10,608	10,888	11,240
Provision for credit losses	782	921	3,575	1,100
Recoveries of loans previously charged-off	70	169	635	554
Loans charged off	(441)	(438)	(1,630)	(1,634)
Balance at end of period	$ 13,468	$ 11,260	$ 13,468	$ 11,260