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Fair Value Measurement - Balance Sheet Grouping (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Carrying Amount    
Financial assets:    
Cash and cash equivalents $ 469,373 $ 560,510
Investment securities:    
HTM, at carrying value 1,186,842 1,186,152
Mortgage-backed securities:    
HTM, at carrying value 120,056 120,901
FHLB stock, at cost 27,958 11,936
Equity investments 4,302 4,383
Loans, net of allowance for loan losses 4,533,811 4,481,836
Loans held for sale 756 10,894
Financial liabilities:    
Deposits 6,545,760 6,549,681
Other borrowings 457,685 509,820
FHLB borrowings 312,466 212,648
Subordinated notes, net of unamortized debt issuance costs 93,913 93,877
Trust preferred subordinated debentures, net of unamortized debt issuance costs 60,271 60,270
Estimated Fair Value    
Financial assets:    
Cash and cash equivalents 469,373 560,510
Investment securities:    
HTM, at carrying value 1,043,056 1,054,739
Mortgage-backed securities:    
HTM, at carrying value 109,130 111,423
FHLB stock, at cost 27,958 11,936
Equity investments 4,302 4,383
Loans, net of allowance for loan losses 4,228,531 4,198,879
Loans held for sale 756 10,894
Financial liabilities:    
Deposits 6,523,686 6,534,929
Other borrowings 458,750 510,242
FHLB borrowings 303,076 202,750
Subordinated notes, net of unamortized debt issuance costs 87,292 86,285
Trust preferred subordinated debentures, net of unamortized debt issuance costs 57,168 57,480
Estimated Fair Value | Level 1    
Financial assets:    
Cash and cash equivalents 469,373 560,510
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 1,043,056 1,054,739
Mortgage-backed securities:    
HTM, at carrying value 109,130 111,423
FHLB stock, at cost 27,958 11,936
Equity investments 4,302 4,383
Loans, net of allowance for loan losses 0 0
Loans held for sale 756 10,894
Financial liabilities:    
Deposits 6,523,686 6,534,929
Other borrowings 458,750 510,242
FHLB borrowings 303,076 202,750
Subordinated notes, net of unamortized debt issuance costs 87,292 86,285
Trust preferred subordinated debentures, net of unamortized debt issuance costs 57,168 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 4,228,531 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