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Securities, Available for Sale (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Debt securities, available-for-sale [Abstract]      
Amortized cost $ 1,694,806 $ 1,318,711  
Unrealized gains 14,497 32,166  
Unrealized losses 21,942 2,179  
Estimated fair value 1,687,361 1,348,698  
Allowance for credit losses on AFS securities 0 0  
Components of net realized gains (losses) on sale of AFS securities [Abstract]      
Gross realized gains 0 3 $ 73
Gross realized (losses) 0 0 (152)
Net AFS realized gains (losses) 0 3 (79)
Gains from calls on securities available for sale 0 3 $ 25
U.S. Treasury [Member]      
Debt securities, available-for-sale [Abstract]      
Amortized cost 73,016    
Unrealized gains 59    
Unrealized losses 6    
Estimated fair value 73,069    
Federal Agency [Member]      
Debt securities, available-for-sale [Abstract]      
Amortized cost 248,454 245,590  
Unrealized gains 0 59  
Unrealized losses 8,523 2,052  
Estimated fair value 239,931 243,597  
State & Municipal [Member]      
Debt securities, available-for-sale [Abstract]      
Amortized cost 95,531 42,550  
Unrealized gains 116 630  
Unrealized losses 1,559 0  
Estimated fair value 94,088 43,180  
Mortgage-Backed, Government Sponsored Enterprises [Member]      
Debt securities, available-for-sale [Abstract]      
Amortized cost 538,036 521,448  
Unrealized gains 8,036 17,079  
Unrealized losses 5,589 22  
Estimated fair value 540,483 538,505  
Mortgage-backed Securities, U.S. Government Agency Securities [Member]      
Debt securities, available-for-sale [Abstract]      
Amortized cost 65,339 55,049  
Unrealized gains 1,108 2,332  
Unrealized losses 255 47  
Estimated fair value 66,192 57,334  
Collateralized Mortgage Obligations, Government-Sponsored Enterprises [Member]      
Debt securities, available-for-sale [Abstract]      
Amortized cost 484,550 311,710  
Unrealized gains 2,723 7,549  
Unrealized losses 5,113 58  
Estimated fair value 482,160 319,201  
Collateralized Mortgage Obligations, U.S. Government Agency Securities [Member]      
Debt securities, available-for-sale [Abstract]      
Amortized cost 139,380 114,864  
Unrealized gains 939 3,739  
Unrealized losses 884 0  
Estimated fair value 139,435 118,603  
Corporate [Member]      
Debt securities, available-for-sale [Abstract]      
Amortized cost 50,500 27,500  
Unrealized gains 1,516 778  
Unrealized losses 13 0  
Estimated fair value $ 52,003 $ 28,278