Fair Value Measurements - Fair Value by Balance Sheet Grouping (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Assets:
Securities held-to-maturity	$ 18,599	$ 33,328
Restricted equity securities	16,239	23,175
Liabilities:
Securities sold under agreements to repurchase	92,093	115,372
Carrying Value
Assets:
Cash and cash equivalents	668,462	201,978
Securities held-to-maturity	18,007	32,188
Loans (excluding impaired loans)	4,003,712	3,820,483
Restricted equity securities	16,239	23,175
Accrued interest receivable	14,761	15,416
Liabilities:
Deposits (excluding demand deposits)	3,101,123	2,934,221
Securities sold under agreements to repurchase	92,093	115,372
FHLB advances	40,000	70,411
Convertible notes payable, net	19,442	18,696
Subordinated debt, net	50,016	49,666
Accrued interest payable	2,369	2,592
Estimated Fair Value
Assets:
Cash and cash equivalents	668,462	201,978
Securities held-to-maturity	18,599	33,328
Loans (excluding impaired loans)	3,949,719	3,780,649
Restricted equity securities	16,239	23,175
Accrued interest receivable	14,761	15,416
Liabilities:
Deposits (excluding demand deposits)	3,106,464	2,947,287
Securities sold under agreements to repurchase	92,093	115,372
FHLB advances	41,514	72,770
Convertible notes payable, net	21,564	20,804
Subordinated debt, net	52,264	49,750
Accrued interest payable	2,369	2,592
Estimated Fair Value | Level 1
Assets:
Cash and cash equivalents	668,462	201,978
Securities held-to-maturity	0	0
Loans (excluding impaired loans)	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	18,599	33,328
Loans (excluding impaired loans)	0	0
Restricted equity securities	16,239	23,175
Accrued interest receivable	1,131	986
Liabilities:
Deposits (excluding demand deposits)	3,106,464	2,947,287
Securities sold under agreements to repurchase	92,093	115,372
FHLB advances	41,514	72,770
Convertible notes payable, net	21,564	20,804
Subordinated debt, net	52,264	49,750
Accrued interest payable	2,369	2,592
Estimated Fair Value | Level 3
Assets:
Cash and cash equivalents	0	0
Securities held-to-maturity	0	0
Loans (excluding impaired loans)	3,949,719	3,780,649
Restricted equity securities	0	0
Accrued interest receivable	13,630	14,430
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