Loans and Allowance for Credit Losses - Changes in Allowance for Credit Losses by Class of Financing Receivable (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	$ 125,559	$ 170,389
Provision for credit losses	(6,129)	(11,632)
Recoveries of loans previously charged-off	1,198	367
Loans charged off	(579)	(1,170)
Balance at end of period	120,049	157,954
Commercial and industrial
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	15,751	14,748
Provision for credit losses	(4,006)	43
Recoveries of loans previously charged-off	958	129
Loans charged off	(4)	(277)
Balance at end of period	12,699	14,643
Construction
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	28,576	58,477
Provision for credit losses	3,206	(19,826)
Recoveries of loans previously charged-off	0	0
Loans charged off	0	(29)
Balance at end of period	31,782	38,622
Residential real estate: | 1-to-4 family mortgage
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	19,104	19,220
Provision for credit losses	1,908	461
Recoveries of loans previously charged-off	12	24
Loans charged off	0	(133)
Balance at end of period	21,024	19,572
Residential real estate: | Residential line of credit
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	5,903	10,534
Provision for credit losses	641	(1,257)
Recoveries of loans previously charged-off	1	6
Loans charged off	0	(15)
Balance at end of period	6,545	9,268
Residential real estate: | Multi-family mortgage
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	6,976	7,174
Provision for credit losses	(578)	4,483
Recoveries of loans previously charged-off	0	0
Loans charged off	0	0
Balance at end of period	6,398	11,657
Commercial real estate: | Owner occupied
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	12,593	4,849
Provision for credit losses	(4,187)	(1,253)
Recoveries of loans previously charged-off	10	13
Loans charged off	0	0
Balance at end of period	8,416	3,609
Commercial real estate: | Non-owner occupied
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	25,768	44,147
Provision for credit losses	(4,478)	6,032
Recoveries of loans previously charged-off	0	0
Loans charged off	0	0
Balance at end of period	21,290	50,179
Consumer and other
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of period	10,888	11,240
Provision for credit losses	1,365	(315)
Recoveries of loans previously charged-off	217	195
Loans charged off	(575)	(716)
Balance at end of period	$ 11,895	$ 10,404