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Securities, Available for Sale (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Debt securities, available-for-sale [Abstract]      
Amortized cost $ 1,707,940   $ 1,743,882
Unrealized gains 59   38
Unrealized losses (195,991)   (216,695)
Estimated fair value 1,512,008   1,527,225
Allowance for credit losses on AFS securities 0   0
Net securities losses 4,998 $ 179  
Gross realized gains   0  
Gross realized losses 5,000 $ 0  
U.S. Treasury [Member]      
Debt securities, available-for-sale [Abstract]      
Amortized cost 132,878   132,891
Unrealized gains 0   0
Unrealized losses (9,299)   (11,233)
Estimated fair value 123,579   121,658
Federal Agency [Member]      
Debt securities, available-for-sale [Abstract]      
Amortized cost 248,410   248,419
Unrealized gains 0   0
Unrealized losses (38,190)   (42,000)
Estimated fair value 210,220   206,419
State & Municipal [Member]      
Debt securities, available-for-sale [Abstract]      
Amortized cost 96,841   97,036
Unrealized gains 17   5
Unrealized losses (11,825)   (14,190)
Estimated fair value 85,033   82,851
Mortgage-Backed, Government Sponsored Enterprises [Member]      
Debt securities, available-for-sale [Abstract]      
Amortized cost 440,537   454,177
Unrealized gains 12   9
Unrealized losses (48,986)   (54,675)
Estimated fair value 391,563   399,511
Mortgage-Backed, U.S. Government Agency Securities [Member]      
Debt securities, available-for-sale [Abstract]      
Amortized cost 78,234   81,844
Unrealized gains 16   15
Unrealized losses (6,235)   (7,676)
Estimated fair value 72,015   74,183
Collateralized Mortgage Obligations, Government-Sponsored Enterprises [Member]      
Debt securities, available-for-sale [Abstract]      
Amortized cost 486,538   498,021
Unrealized gains 14   9
Unrealized losses (51,869)   (59,473)
Estimated fair value 434,683   438,557
Collateralized Mortgage Obligations, U.S. Government Agency Securities [Member]      
Debt securities, available-for-sale [Abstract]      
Amortized cost 169,088   171,090
Unrealized gains 0   0
Unrealized losses (21,410)   (21,284)
Estimated fair value 147,678   149,806
Corporate [Member]      
Debt securities, available-for-sale [Abstract]      
Amortized cost 55,414   60,404
Unrealized gains 0   0
Unrealized losses (8,177)   (6,164)
Estimated fair value 47,237   $ 54,240
Loss on the write-off of an AFS debt security 5,000    
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Corporate [Member]      
Debt securities, available-for-sale [Abstract]      
Net securities losses $ 5,000