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Securities - Unrealized Loss Positions (Details)
 3 Months Ended
Mar. 31, 2022
USD ($)
security
Dec. 31, 2021
USD ($)
security
Securities Available-for-Sale, Number of Securities    
Less than 12 months in an unrealized loss position | security 434 241
Greater than 12 months in an unrealized loss position | security 17 11
Total 451 252
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 51,797,000 $ 4,230,000
Greater than 12 months in an unrealized loss position 2,589,000 885,000
Total 54,386,000 5,115,000
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 1,290,336,000 734,235,000
Greater than 12 months in an unrealized loss position 35,508,000 24,626,000
Total 1,325,844,000 $ 758,861,000
Credit losses were determined 0  
Provision for credit losses on securities $ 0  
U.S. Treasury    
Securities Available-for-Sale, Number of Securities    
Less than 12 months in an unrealized loss position | security 5 1
Total 5 1
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 7,096,000 $ 37,000
Total 7,096,000 37,000
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 216,531,000 49,719,000
Total $ 216,531,000 $ 49,719,000
U.S. government agencies    
Securities Available-for-Sale, Number of Securities    
Less than 12 months in an unrealized loss position | security 5 5
Greater than 12 months in an unrealized loss position | security 4 4
Total 9 9
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 2,884,000 $ 592,000
Greater than 12 months in an unrealized loss position 109,000 107,000
Total 2,993,000 699,000
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 54,588,000 56,879,000
Greater than 12 months in an unrealized loss position 4,448,000 5,008,000
Total $ 59,036,000 $ 61,887,000
Mortgage Backed Securities, Issued by US Government Agencies    
Securities Available-for-Sale, Number of Securities    
Less than 12 months in an unrealized loss position | security 124 63
Greater than 12 months in an unrealized loss position | security 5 1
Total 129 64
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 7,322,000 $ 505,000
Greater than 12 months in an unrealized loss position 766,000 65,000
Total 8,088,000 570,000
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 142,866,000 78,711,000
Greater than 12 months in an unrealized loss position 5,341,000 1,663,000
Total $ 148,207,000 $ 80,374,000
States and political subdivisions    
Securities Available-for-Sale, Number of Securities    
Less than 12 months in an unrealized loss position | security 27 7
Greater than 12 months in an unrealized loss position | security 1 1
Total 28 8
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 4,535,000 $ 55,000
Greater than 12 months in an unrealized loss position 1,403,000 617,000
Total 5,938,000 672,000
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 90,991,000 8,430,000
Greater than 12 months in an unrealized loss position 3,232,000 4,051,000
Total $ 94,223,000 $ 12,481,000
Corporate bonds    
Securities Available-for-Sale, Number of Securities    
Less than 12 months in an unrealized loss position | security 2 2
Total 2 2
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 317,000 $ 113,000
Total 317,000 113,000
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 9,683,000 9,887,000
Total $ 9,683,000 $ 9,887,000
Collateralized mortgage obligations    
Securities Available-for-Sale, Number of Securities    
Less than 12 months in an unrealized loss position | security 208 133
Greater than 12 months in an unrealized loss position | security 1  
Total 209 133
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 24,649,000 $ 2,285,000
Greater than 12 months in an unrealized loss position 96,000  
Total 24,745,000 2,285,000
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 647,144,000 381,658,000
Greater than 12 months in an unrealized loss position 7,366,000  
Total $ 654,510,000 $ 381,658,000
Asset-backed Securities    
Securities Available-for-Sale, Number of Securities    
Less than 12 months in an unrealized loss position | security 41 20
Greater than 12 months in an unrealized loss position | security 4 3
Total 45 23
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 4,109,000 $ 608,000
Greater than 12 months in an unrealized loss position 131,000 53,000
Total 4,240,000 661,000
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 230,000 103,819,000
Greater than 12 months in an unrealized loss position 4,534,000 3,276,000
Total $ 4,764,000 $ 107,095,000
Collateralized loan obligations.    
Securities Available-for-Sale, Number of Securities    
Less than 12 months in an unrealized loss position | security 22 10
Greater than 12 months in an unrealized loss position | security 2 2
Total 24 12
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 885,000 $ 35,000
Greater than 12 months in an unrealized loss position 84,000 43,000
Total 969,000 78,000
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 128,303,000 45,132,000
Greater than 12 months in an unrealized loss position 10,587,000 10,628,000
Total $ 138,890,000 $ 55,760,000