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Securities, Available for Sale (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Debt securities, available-for-sale [Abstract]          
Amortized cost $ 1,672,191   $ 1,672,191   $ 1,743,882
Unrealized gains 25   25   38
Unrealized losses (218,290)   (218,290)   (216,695)
Estimated fair value 1,453,926   1,453,926   1,527,225
Allowance for credit losses on AFS securities 0   0   0
Gross realized gains   $ 0   $ 0  
Gross realized losses 4,500 $ 0 4,500 $ 0  
U.S. Treasury [Member]          
Debt securities, available-for-sale [Abstract]          
Amortized cost 133,019   133,019   132,891
Unrealized gains 0   0   0
Unrealized losses (11,022)   (11,022)   (11,233)
Estimated fair value 121,997   121,997   121,658
Federal Agency [Member]          
Debt securities, available-for-sale [Abstract]          
Amortized cost 248,401   248,401   248,419
Unrealized gains 0   0   0
Unrealized losses (39,748)   (39,748)   (42,000)
Estimated fair value 208,653   208,653   206,419
State & Municipal [Member]          
Debt securities, available-for-sale [Abstract]          
Amortized cost 96,645   96,645   97,036
Unrealized gains 2   2   5
Unrealized losses (12,472)   (12,472)   (14,190)
Estimated fair value 84,175   84,175   82,851
Mortgage-Backed, Government Sponsored Enterprises [Member]          
Debt securities, available-for-sale [Abstract]          
Amortized cost 426,190   426,190   454,177
Unrealized gains 4   4   9
Unrealized losses (53,872)   (53,872)   (54,675)
Estimated fair value 372,322   372,322   399,511
Mortgage-Backed, U.S. Government Agency Securities [Member]          
Debt securities, available-for-sale [Abstract]          
Amortized cost 77,869   77,869   81,844
Unrealized gains 11   11   15
Unrealized losses (8,813)   (8,813)   (7,676)
Estimated fair value 69,067   69,067   74,183
Collateralized Mortgage Obligations, Government-Sponsored Enterprises [Member]          
Debt securities, available-for-sale [Abstract]          
Amortized cost 474,708   474,708   498,021
Unrealized gains 8   8   9
Unrealized losses (58,849)   (58,849)   (59,473)
Estimated fair value 415,867   415,867   438,557
Collateralized Mortgage Obligations, U.S. Government Agency Securities [Member]          
Debt securities, available-for-sale [Abstract]          
Amortized cost 166,936   166,936   171,090
Unrealized gains 0   0   0
Unrealized losses (25,434)   (25,434)   (21,284)
Estimated fair value 141,502   141,502   149,806
Corporate [Member]          
Debt securities, available-for-sale [Abstract]          
Amortized cost 48,423   48,423   60,404
Unrealized gains 0   0   0
Unrealized losses (8,080)   (8,080)   (6,164)
Estimated fair value $ 40,343   40,343   $ 54,240
Loss on the write-off of an AFS debt security     $ 5,000