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Securities, Available for Sale (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Debt securities, available-for-sale [Abstract]          
Amortized cost $ 1,567,372   $ 1,567,372   $ 1,318,711
Unrealized gains 21,168   21,168   32,166
Unrealized losses 12,510   12,510   2,179
Estimated fair value 1,576,030   1,576,030   1,348,698
Allowance for credit losses on AFS securities 0   0   0
Gross realized gains 0 $ 0 0 $ 3  
Gross realized losses 0 $ 0 0    
Gains from calls on securities available for sale       $ 3  
Federal Agency [Member]          
Debt securities, available-for-sale [Abstract]          
Amortized cost 248,462   248,462   245,590
Unrealized gains 0   0   59
Unrealized losses 5,496   5,496   2,052
Estimated fair value 242,966   242,966   243,597
State & Municipal [Member]          
Debt securities, available-for-sale [Abstract]          
Amortized cost 84,636   84,636   42,550
Unrealized gains 138   138   630
Unrealized losses 753   753   0
Estimated fair value 84,021   84,021   43,180
Mortgage-Backed, Government Sponsored Enterprises [Member]          
Debt securities, available-for-sale [Abstract]          
Amortized cost 575,884   575,884   521,448
Unrealized gains 10,907   10,907   17,079
Unrealized losses 3,959   3,959   22
Estimated fair value 582,832   582,832   538,505
Mortgage-Backed, U.S. Government Agency Securities [Member]          
Debt securities, available-for-sale [Abstract]          
Amortized cost 65,762   65,762   55,049
Unrealized gains 1,710   1,710   2,332
Unrealized losses 109   109   47
Estimated fair value 67,363   67,363   57,334
Collateralized Mortgage Obligations, Government-Sponsored Enterprises [Member]          
Debt securities, available-for-sale [Abstract]          
Amortized cost 438,255   438,255   311,710
Unrealized gains 5,002   5,002   7,549
Unrealized losses 2,004   2,004   58
Estimated fair value 441,253   441,253   319,201
Collateralized Mortgage Obligations, U.S. Government Agency Securities [Member]          
Debt securities, available-for-sale [Abstract]          
Amortized cost 115,873   115,873   114,864
Unrealized gains 1,774   1,774   3,739
Unrealized losses 189   189   0
Estimated fair value 117,458   117,458   118,603
Corporate [Member]          
Debt securities, available-for-sale [Abstract]          
Amortized cost 38,500   38,500   27,500
Unrealized gains 1,637   1,637   778
Unrealized losses 0   0   0
Estimated fair value $ 40,137   $ 40,137   $ 28,278