Fair Value Measurements - Estimated Fair Values of Financial Instruments Not Carried at Fair Value (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Assets:
Securities held-to-maturity	$ 30,792	$ 33,218
Restricted equity securities	35,396	50,215
Liabilities:
Securities sold under agreements to repurchase	25,868	36,721
Carrying Value
Assets:
Cash and cash equivalents	443,887	343,526
Securities held-to-maturity	37,410	38,901
Loans (excluding collateral dependent loans at fair value)	6,170,595	5,871,274
Restricted equity securities	35,396	50,215
Accrued interest receivable	37,218	28,543
Liabilities:
Deposits (excluding demand deposits)	4,288,352	3,732,215
Securities sold under agreements to repurchase	25,868	36,721
FHLB advances	330,000	643,885
Convertible notes payable, net		5,355
Subordinated debt, net	75,180	74,880
Accrued interest payable	9,862	5,798
Estimated Fair Value
Assets:
Cash and cash equivalents	443,887	343,526
Securities held-to-maturity	30,792	33,218
Loans (excluding collateral dependent loans at fair value)	6,036,398	5,756,197
Restricted equity securities	35,396	50,215
Accrued interest receivable	37,218	28,543
Liabilities:
Deposits (excluding demand deposits)	4,273,238	3,696,438
Securities sold under agreements to repurchase	25,868	36,721
FHLB advances	330,000	643,885
Convertible notes payable, net		5,329
Subordinated debt, net	70,934	71,618
Accrued interest payable	9,862	5,798
Estimated Fair Value | Level 1
Assets:
Cash and cash equivalents	443,887	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)	2,511,783	0
Securities sold under agreements to repurchase	0	0
FHLB advances	0	0
Convertible notes payable, net		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	30,792	33,218
Loans (excluding collateral dependent loans at fair value)	0	0
Restricted equity securities	35,396	50,215
Accrued interest receivable	2,328	2,049
Liabilities:
Deposits (excluding demand deposits)	1,761,455	3,696,438
Securities sold under agreements to repurchase	25,868	36,721
FHLB advances	330,000	643,885
Convertible notes payable, net		5,329
Subordinated debt, net	70,934	71,618
Accrued interest payable	9,862	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)	6,036,398	5,756,197
Restricted equity securities	0	0
Accrued interest receivable	34,890	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
Subordinated debt, net	0	0
Accrued interest payable	$ 0	$ 0