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Fair Value of Assets and Liabilities - Summary of Financial Instruments Not Required to be Measured at Fair Value (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Jun. 30, 2024
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Dec. 31, 2022
Assets:            
Carrying Amount $ 693,873   $ 683,895      
Fair Value 636,529   612,022      
Loans and leases, net of deferred fees and costs [1] 6,271,839   6,159,196      
Liabilities:            
Debt securities held to maturity, allowance for credit loss 236   238      
Allowance for credit losses (on PCD loans) 66,639 $ 66,247 62,011 $ 62,924 $ 61,211 $ 53,162
Carrying Amount            
Assets:            
Carrying Amount 693,873   683,895      
Federal Home Loan Bank ("FHLB") stock 20,245   29,949      
Federal Reserve Bank ("FRB") stock 27,114   26,896      
Total other investment securities at cost 47,359   56,845      
Total other investment securities 55,263   62,992      
Carrying Amount | Level 1            
Assets:            
Cash and cash equivalents 283,707   426,722      
Carrying Amount | Level 2            
Assets:            
Bank owned life insurance 143,065   140,554      
Liabilities:            
Deposits 7,483,157   7,152,297      
Short-term borrowings 175,945   601,121      
Long-term borrowings 236,824   216,241      
Carrying Amount | Level 3            
Assets:            
Loans and leases, net of deferred fees and costs 6,271,839   6,159,196 [1]      
Fair Value            
Assets:            
Fair Value 636,529   612,022      
Federal Home Loan Bank ("FHLB") stock 20,245   29,949      
Federal Reserve Bank ("FRB") stock 27,114   26,896      
Total other investment securities at cost 47,359   56,845      
Total other investment securities 55,263   62,992      
Fair Value | Level 1            
Assets:            
Cash and cash equivalents 283,707   426,722      
Fair Value | Level 2            
Assets:            
Bank owned life insurance 143,065   140,554      
Liabilities:            
Deposits 6,811,258   6,319,885      
Short-term borrowings 187,869   619,999      
Long-term borrowings 252,873   222,743      
Fair Value | Level 3            
Assets:            
Loans and leases, net of deferred fees and costs, fair value 6,229,349   6,064,999      
U.S. government sponsored agencies            
Assets:            
Carrying Amount 196,642   188,475      
Fair Value 191,610   180,825      
Liabilities:            
Debt securities held to maturity, allowance for credit loss 0   0      
U.S. government sponsored agencies | Carrying Amount | Level 2            
Assets:            
Carrying Amount 196,642   188,475      
U.S. government sponsored agencies | Fair Value | Level 2            
Assets:            
Fair Value 191,610   180,825      
States and political subdivisions            
Assets:            
Carrying Amount 141,918   144,496      
Fair Value 115,674   114,288      
Liabilities:            
Debt securities held to maturity, allowance for credit loss 236   238      
States and political subdivisions | Carrying Amount | Level 2            
Assets:            
Carrying Amount 141,918   144,496      
States and political subdivisions | Fair Value | Level 2            
Assets:            
Fair Value     114,288      
Residential mortgage-backed securities            
Assets:            
Carrying Amount 256,329   248,559      
Fair Value 243,499   231,620      
Liabilities:            
Debt securities held to maturity, allowance for credit loss 0   0      
Residential mortgage-backed securities | Carrying Amount | Level 2            
Assets:            
Carrying Amount 256,329   248,559      
Residential mortgage-backed securities | Fair Value | Level 2            
Assets:            
Fair Value 243,499   231,620      
Commercial mortgage-backed securities            
Assets:            
Carrying Amount 98,984   102,365      
Fair Value 85,746   85,289      
Liabilities:            
Debt securities held to maturity, allowance for credit loss 0   0      
Commercial mortgage-backed securities | Carrying Amount | Level 2            
Assets:            
Carrying Amount 98,984   102,365      
Commercial mortgage-backed securities | Fair Value | Level 2            
Assets:            
Fair Value 85,746   85,289      
Nonqualified Plan | Carrying Amount | Level 1            
Assets:            
Total other investment securities 4,729   3,162      
Nonqualified Plan | Fair Value | Level 1            
Assets:            
Total other investment securities 4,729   3,162      
Other investment securities | Carrying Amount | Level 2            
Assets:            
Total other investment securities 3,175   2,985      
Other investment securities | Fair Value | Level 2            
Assets:            
Total other investment securities $ 3,175   $ 2,985      
[1] Also referred to throughout this Quarterly Report on Form 10-Q as "total loans" and "loans held for investment."