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Fair Value Measurement - Balance Sheet Grouping (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Carrying Amount    
Financial assets:    
Cash and cash equivalents $ 486,297 $ 560,510
Investment securities:    
HTM, at carrying value 1,172,332 1,186,152
Mortgage-backed securities:    
HTM, at carrying value 116,071 120,901
FHLB stock, at cost 40,291 11,936
Equity investments 4,301 4,383
Loans, net of allowance for loan losses 4,533,772 4,481,836
Loans held for sale 768 10,894
Financial liabilities:    
Deposits 6,435,702 6,549,681
Other borrowings 105,810 509,820
FHLB borrowings 760,046 212,648
Subordinated notes, net of unamortized debt issuance costs 92,006 93,877
Trust preferred subordinated debentures, net of unamortized debt issuance costs 60,273 60,270
Estimated Fair Value    
Financial assets:    
Cash and cash equivalents 486,297 560,510
Investment securities:    
HTM, at carrying value 1,060,369 1,054,739
Mortgage-backed securities:    
HTM, at carrying value 109,154 111,423
FHLB stock, at cost 40,291 11,936
Equity investments 4,301 4,383
Loans, net of allowance for loan losses 4,418,820 4,198,879
Loans held for sale 768 10,894
Financial liabilities:    
Deposits 6,436,589 6,534,929
Other borrowings 105,668 510,242
FHLB borrowings 755,052 202,750
Subordinated notes, net of unamortized debt issuance costs 85,253 86,285
Trust preferred subordinated debentures, net of unamortized debt issuance costs 51,946 57,480
Estimated Fair Value | Level 1    
Financial assets:    
Cash and cash equivalents 486,297 560,510
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 1,060,369 1,054,739
Mortgage-backed securities:    
HTM, at carrying value 109,154 111,423
FHLB stock, at cost 40,291 11,936
Equity investments 4,301 4,383
Loans, net of allowance for loan losses 0 0
Loans held for sale 768 10,894
Financial liabilities:    
Deposits 6,436,589 6,534,929
Other borrowings 105,668 510,242
FHLB borrowings 755,052 202,750
Subordinated notes, net of unamortized debt issuance costs 85,253 86,285
Trust preferred subordinated debentures, net of unamortized debt issuance costs 51,946 57,480
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 4,418,820 4,198,879
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