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Investment Securities - Carrying value and estimated fair value (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Apr. 01, 2022
Schedule of Available-for-sale Securities      
Debt Securities, Amortized Cost $ 669,646 $ 740,468  
Available-for-sale Securities, Gross Unrealized Gains 13 18  
Available-for-sale Securities, Gross Unrealized Losses (72,463) (91,661)  
Available-for-sale debt securities, at fair value, net of allowance for credit losses of $0, with an amortized cost of $669,646 at December 31, 2023 and $740,468 at December 31, 2022 597,196 648,825  
Investment securities not due at a single maturity date, amortized cost 302,442 305,107  
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 70 67  
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (26,560) (33,925) $ (25,300)
Investment securities not due at a single maturity date, estimated fair value 277,003 271,249  
Debt Securities, Available-for-Sale, Allowance for Credit Loss 0    
Debt Securities, Held-to-Maturity, Allowance for Credit Loss 1,051    
Securities Pledged as Collateral      
Schedule of Available-for-sale Securities      
Investment securities not due at a single maturity date, amortized cost 303,493    
US Treasury Securities      
Schedule of Available-for-sale Securities      
Debt Securities, Amortized Cost 9,990 9,990  
Available-for-sale Securities, Gross Unrealized Gains 0 0  
Available-for-sale Securities, Gross Unrealized Losses (1,036) (1,283)  
Available-for-sale debt securities, at fair value, net of allowance for credit losses of $0, with an amortized cost of $669,646 at December 31, 2023 and $740,468 at December 31, 2022 8,954 8,707  
Debt Securities, Available-for-Sale, Allowance for Credit Loss 0    
U.S. Government agencies      
Schedule of Available-for-sale Securities      
Debt Securities, Amortized Cost 102 107  
Available-for-sale Securities, Gross Unrealized Gains 0 0  
Available-for-sale Securities, Gross Unrealized Losses (7) (9)  
Available-for-sale debt securities, at fair value, net of allowance for credit losses of $0, with an amortized cost of $669,646 at December 31, 2023 and $740,468 at December 31, 2022 95 98  
Debt Securities, Available-for-Sale, Allowance for Credit Loss 0    
Obligations of states and political subdivisions      
Schedule of Available-for-sale Securities      
Debt Securities, Amortized Cost 198,070 201,638  
Available-for-sale Securities, Gross Unrealized Gains 0 0  
Available-for-sale Securities, Gross Unrealized Losses (17,848) (26,653)  
Available-for-sale debt securities, at fair value, net of allowance for credit losses of $0, with an amortized cost of $669,646 at December 31, 2023 and $740,468 at December 31, 2022 180,222 174,985  
Investment securities not due at a single maturity date, amortized cost 192,070 192,004  
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 70 67  
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (14,188) (23,166)  
Investment securities not due at a single maturity date, estimated fair value 177,952 168,905  
Debt Securities, Available-for-Sale, Allowance for Credit Loss 0    
Debt Securities, Held-to-Maturity, Allowance for Credit Loss 20    
U.S. Government sponsored entities and agencies collateralized by residential mortgage obligations      
Schedule of Available-for-sale Securities      
Debt Securities, Amortized Cost 88,874 117,292  
Available-for-sale Securities, Gross Unrealized Gains 3 4  
Available-for-sale Securities, Gross Unrealized Losses (5,525) (7,803)  
Available-for-sale debt securities, at fair value, net of allowance for credit losses of $0, with an amortized cost of $669,646 at December 31, 2023 and $740,468 at December 31, 2022 83,352 109,493  
Investment securities not due at a single maturity date, amortized cost 10,758 10,430  
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0 0  
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (1,692) (1,762)  
Investment securities not due at a single maturity date, estimated fair value 9,066 8,668  
Debt Securities, Available-for-Sale, Allowance for Credit Loss 0    
Debt Securities, Held-to-Maturity, Allowance for Credit Loss 0    
Private label residential mortgage and asset backed securities      
Schedule of Available-for-sale Securities      
Debt Securities, Amortized Cost 372,610 411,441  
Available-for-sale Securities, Gross Unrealized Gains 10 14  
Available-for-sale Securities, Gross Unrealized Losses (48,047) (55,913)  
Available-for-sale debt securities, at fair value, net of allowance for credit losses of $0, with an amortized cost of $669,646 at December 31, 2023 and $740,468 at December 31, 2022 324,573 355,542  
Investment securities not due at a single maturity date, amortized cost 54,579 56,691  
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0 0  
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (5,944) (5,931)  
Investment securities not due at a single maturity date, estimated fair value 48,635 50,760  
Debt Securities, Available-for-Sale, Allowance for Credit Loss 0    
Debt Securities, Held-to-Maturity, Allowance for Credit Loss 11    
Corporate Debt Securities      
Schedule of Available-for-sale Securities      
Debt Securities, Amortized Cost   0  
Available-for-sale Securities, Gross Unrealized Gains   0  
Available-for-sale Securities, Gross Unrealized Losses   0  
Available-for-sale debt securities, at fair value, net of allowance for credit losses of $0, with an amortized cost of $669,646 at December 31, 2023 and $740,468 at December 31, 2022   0  
Investment securities not due at a single maturity date, amortized cost 46,086 45,982  
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0 0  
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss (4,736) (3,066)  
Investment securities not due at a single maturity date, estimated fair value 41,350 $ 42,916  
Debt Securities, Held-to-Maturity, Allowance for Credit Loss $ 1,020