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Fair Value Measurement - Balance Sheet Grouping (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Carrying Amount    
Financial assets:    
Cash and cash equivalents $ 325,823 $ 199,252
Investment securities:    
HTM, at carrying value 1,185,474 1,190,108
Mortgage-backed securities:    
HTM, at carrying value 122,412 136,621
FHLB stock, at cost 12,778 9,190
Equity investments 4,382 5,946
Loans, net of allowance for loan losses 4,378,873 4,111,176
Loans held for sale 1,382 667
Financial liabilities:    
Deposits 6,349,571 6,198,019
Other borrowings 395,209 221,153
FHLB borrowings 212,829 153,358
Subordinated notes, net of unamortized debt issuance costs 93,838 98,674
Trust preferred subordinated debentures, net of unamortized debt issuance costs 60,269 60,265
Estimated Fair Value    
Financial assets:    
Cash and cash equivalents 325,823 199,252
Investment securities:    
HTM, at carrying value 944,586 1,023,376
Mortgage-backed securities:    
HTM, at carrying value 107,844 125,780
FHLB stock, at cost 12,778 9,190
Equity investments 4,382 5,946
Loans, net of allowance for loan losses 3,962,889 3,880,664
Loans held for sale 1,382 667
Financial liabilities:    
Deposits 6,315,058 6,158,517
Other borrowings 393,551 221,153
FHLB borrowings 198,457 140,976
Subordinated notes, net of unamortized debt issuance costs 84,992 91,357
Trust preferred subordinated debentures, net of unamortized debt issuance costs 52,568 60,594
Estimated Fair Value | Level 1    
Financial assets:    
Cash and cash equivalents 325,823 199,252
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 944,586 1,023,376
Mortgage-backed securities:    
HTM, at carrying value 107,844 125,780
FHLB stock, at cost 12,778 9,190
Equity investments 4,382 5,946
Loans, net of allowance for loan losses 0 0
Loans held for sale 1,382 667
Financial liabilities:    
Deposits 6,315,058 6,158,517
Other borrowings 393,551 221,153
FHLB borrowings 198,457 140,976
Subordinated notes, net of unamortized debt issuance costs 84,992 91,357
Trust preferred subordinated debentures, net of unamortized debt issuance costs 52,568 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 3,962,889 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