Fair Value Measurements - Estimated Fair Values of Financial Instruments Not Carried at Fair Value (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Assets:
Securities held-to-maturity	$ 32,827	$ 33,218
Restricted equity securities	46,364	50,215
Liabilities:
Securities sold under agreements to repurchase	32,861	36,721
Carrying Value
Assets:
Cash and cash equivalents	492,735	343,526
Securities held-to-maturity	37,883	38,901
Loans (excluding collateral dependent loans at fair value)	6,120,057	5,871,274
Restricted equity securities	46,364	50,215
Accrued interest receivable	29,464	28,543
Liabilities:
Deposits (excluding demand deposits)	4,103,392	3,732,215
Securities sold under agreements to repurchase	32,861	36,721
FHLB advances	570,585	643,885
Convertible notes payable, net	5,431	5,355
Subordinated debt, net	75,080	74,880
Accrued interest payable	13,542	5,798
Estimated Fair Value
Assets:
Cash and cash equivalents	492,735	343,526
Securities held-to-maturity	32,827	33,218
Loans (excluding collateral dependent loans at fair value)	5,994,987	5,756,197
Restricted equity securities	46,364	50,215
Accrued interest receivable	29,464	28,543
Liabilities:
Deposits (excluding demand deposits)	4,084,567	3,696,438
Securities sold under agreements to repurchase	32,861	36,721
FHLB advances	570,585	643,885
Convertible notes payable, net	5,388	5,329
Subordinated debt, net	70,841	71,618
Accrued interest payable	13,542	5,798
Estimated Fair Value | Level 1
Assets:
Cash and cash equivalents	492,735	343,526
Securities held-to-maturity	0	0
Loans (excluding collateral dependent loans at fair value)	0	0
Restricted equity securities	0	0
Accrued interest receivable	0	0
Liabilities:
Deposits (excluding demand deposits)	0	0
Securities sold under agreements to repurchase	0	0
FHLB advances	0	0
Convertible notes payable, net	0	0
Subordinated debt, net	0	0
Accrued interest payable	0	0
Estimated Fair Value | Level 2
Assets:
Cash and cash equivalents	0	0
Securities held-to-maturity	32,827	33,218
Loans (excluding collateral dependent loans at fair value)	0	0
Restricted equity securities	46,364	50,215
Accrued interest receivable	1,999	2,049
Liabilities:
Deposits (excluding demand deposits)	4,084,567	3,696,438
Securities sold under agreements to repurchase	32,861	36,721
FHLB advances	570,585	643,885
Convertible notes payable, net	5,388	5,329
Subordinated debt, net	70,841	71,618
Accrued interest payable	13,542	5,798
Estimated Fair Value | Level 3
Assets:
Cash and cash equivalents	0	0
Securities held-to-maturity	0	0
Loans (excluding collateral dependent loans at fair value)	5,994,987	5,756,197
Restricted equity securities	0	0
Accrued interest receivable	27,465	26,494
Liabilities:
Deposits (excluding demand deposits)	0	0
Securities sold under agreements to repurchase	0	0
FHLB advances	0	0
Convertible notes payable, net	0	0
Subordinated debt, net	0	0
Accrued interest payable	$ 0	$ 0