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Fair Value Measurement - Balance Sheet Grouping (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Carrying Amount    
Financial assets:    
Cash and cash equivalents $ 310,492 $ 199,252
Investment securities:    
HTM, at carrying value 1,184,257 1,190,108
Mortgage-backed securities:    
HTM, at carrying value 124,200 136,621
FHLB stock, at cost 16,696 9,190
Equity investments 4,590 5,946
Loans, net of allowance for loan losses 4,116,312 4,111,176
Loans held for sale 407 667
Financial liabilities:    
Deposits 5,838,220 6,198,019
Other borrowings 625,627 221,153
FHLB borrowings 333,183 153,358
Subordinated notes, net of unamortized debt issuance costs 98,710 98,674
Trust preferred subordinated debentures, net of unamortized debt issuance costs 60,266 60,265
Estimated Fair Value    
Financial assets:    
Cash and cash equivalents 310,492 199,252
Investment securities:    
HTM, at carrying value 1,056,754 1,023,376
Mortgage-backed securities:    
HTM, at carrying value 115,820 125,780
FHLB stock, at cost 16,696 9,190
Equity investments 4,590 5,946
Loans, net of allowance for loan losses 3,861,859 3,880,664
Loans held for sale 407 667
Financial liabilities:    
Deposits 5,807,050 6,158,517
Other borrowings 630,270 221,153
FHLB borrowings 321,144 140,976
Subordinated notes, net of unamortized debt issuance costs 89,952 91,357
Trust preferred subordinated debentures, net of unamortized debt issuance costs 54,520 60,594
Estimated Fair Value | Level 1    
Financial assets:    
Cash and cash equivalents 310,492 199,252
Investment securities:    
HTM, at carrying value 0 0
Mortgage-backed securities:    
HTM, at carrying value 0 0
FHLB stock, at cost 0 0
Equity investments 0 0
Loans, net of allowance for loan losses 0 0
Loans held for sale 0 0
Financial liabilities:    
Deposits 0 0
Other borrowings 0 0
FHLB borrowings 0 0
Subordinated notes, net of unamortized debt issuance costs 0 0
Trust preferred subordinated debentures, net of unamortized debt issuance costs 0 0
Estimated Fair Value | Level 2    
Financial assets:    
Cash and cash equivalents 0 0
Investment securities:    
HTM, at carrying value 1,056,754 1,023,376
Mortgage-backed securities:    
HTM, at carrying value 115,820 125,780
FHLB stock, at cost 16,696 9,190
Equity investments 4,590 5,946
Loans, net of allowance for loan losses 0 0
Loans held for sale 407 667
Financial liabilities:    
Deposits 5,807,050 6,158,517
Other borrowings 630,270 221,153
FHLB borrowings 321,144 140,976
Subordinated notes, net of unamortized debt issuance costs 89,952 91,357
Trust preferred subordinated debentures, net of unamortized debt issuance costs 54,520 60,594
Estimated Fair Value | Level 3    
Financial assets:    
Cash and cash equivalents 0 0
Investment securities:    
HTM, at carrying value 0 0
Mortgage-backed securities:    
HTM, at carrying value 0 0
FHLB stock, at cost 0 0
Equity investments 0 0
Loans, net of allowance for loan losses 3,861,859 3,880,664
Loans held for sale 0 0
Financial liabilities:    
Deposits 0 0
Other borrowings 0 0
FHLB borrowings 0 0
Subordinated notes, net of unamortized debt issuance costs 0 0
Trust preferred subordinated debentures, net of unamortized debt issuance costs $ 0 $ 0