Loans and Allowance for Credit Losses - Loans Outstanding by Class of Financing Receivable (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020
Financing Receivable, Past Due [Line Items]
Gross loans	$ 8,004,976	$ 7,604,662
Less: Allowance for credit losses	(120,049)	(125,559)	$ (157,954)	$ (170,389)
Net loans	7,884,927	7,479,103
Paycheck Protection Program
Financing Receivable, Past Due [Line Items]
Loans originated as part of PPP program	2,062	3,990
Commercial and industrial
Financing Receivable, Past Due [Line Items]
Gross loans	1,380,600	1,290,565
Less: Allowance for credit losses	(12,699)	(15,751)	(14,643)	(14,748)
Construction
Financing Receivable, Past Due [Line Items]
Gross loans	1,468,811	1,327,659
Less: Allowance for credit losses	(31,782)	(28,576)	(38,622)	(58,477)
Residential real estate: | 1-to-4 family mortgage
Financing Receivable, Past Due [Line Items]
Gross loans	1,346,349	1,270,467
Less: Allowance for credit losses	(21,024)	(19,104)	(19,572)	(19,220)
Residential real estate: | Residential line of credit
Financing Receivable, Past Due [Line Items]
Gross loans	392,740	383,039
Less: Allowance for credit losses	(6,545)	(5,903)	(9,268)	(10,534)
Residential real estate: | Multi-family mortgage
Financing Receivable, Past Due [Line Items]
Gross loans	400,501	326,551
Less: Allowance for credit losses	(6,398)	(6,976)	(11,657)	(7,174)
Commercial real estate: | Owner occupied
Financing Receivable, Past Due [Line Items]
Gross loans	978,436	951,582
Less: Allowance for credit losses	(8,416)	(12,593)	(3,609)	(4,849)
Commercial real estate: | Non-owner occupied
Financing Receivable, Past Due [Line Items]
Gross loans	1,706,546	1,730,165
Less: Allowance for credit losses	(21,290)	(25,768)	(50,179)	(44,147)
Consumer and other
Financing Receivable, Past Due [Line Items]
Gross loans	330,993	324,634
Less: Allowance for credit losses	$ (11,895)	$ (10,888)	$ (10,404)	$ (11,240)