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Securities - Unrealized Loss Positions (Details)
 3 Months Ended
Sep. 30, 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 488 241
Greater than 12 months in an unrealized loss position | security 46 11
Total 534 252
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 110,847,000 $ 4,230,000
Greater than 12 months in an unrealized loss position 20,153,000 885,000
Total 131,000,000 5,115,000
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 1,421,936,000 734,235,000
Greater than 12 months in an unrealized loss position 170,586,000 24,626,000
Total 1,592,522,000 $ 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 $ 12,813,000 $ 37,000
Total 12,813,000 37,000
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 211,097,000 49,719,000
Total $ 211,097,000 $ 49,719,000
U.S. government agencies    
Securities Available-for-Sale, Number of Securities    
Less than 12 months in an unrealized loss position | security 2 5
Greater than 12 months in an unrealized loss position | security 7 4
Total 9 9
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 1,987,000 $ 592,000
Greater than 12 months in an unrealized loss position 3,414,000 107,000
Total 5,401,000 699,000
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 27,188,000 56,879,000
Greater than 12 months in an unrealized loss position 28,775,000 5,008,000
Total $ 55,963,000 $ 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 126 63
Greater than 12 months in an unrealized loss position | security 6 1
Total 132 64
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 16,766,000 $ 505,000
Greater than 12 months in an unrealized loss position 1,465,000 65,000
Total 18,231,000 570,000
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 122,905,000 78,711,000
Greater than 12 months in an unrealized loss position 4,721,000 1,663,000
Total $ 127,626,000 $ 80,374,000
States and political subdivisions    
Securities Available-for-Sale, Number of Securities    
Less than 12 months in an unrealized loss position | security 79 7
Greater than 12 months in an unrealized loss position | security 3 1
Total 82 8
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 18,155,000 $ 55,000
Greater than 12 months in an unrealized loss position 1,102,000 617,000
Total 19,257,000 672,000
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 219,497,000 8,430,000
Greater than 12 months in an unrealized loss position 4,510,000 4,051,000
Total $ 224,007,000 $ 12,481,000
Corporate bonds    
Securities Available-for-Sale, Number of Securities    
Less than 12 months in an unrealized loss position | security 1 2
Greater than 12 months in an unrealized loss position | security 1  
Total 2 2
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 286,000 $ 113,000
Greater than 12 months in an unrealized loss position 170,000  
Total 456,000 113,000
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 4,715,000 9,887,000
Greater than 12 months in an unrealized loss position 4,829,000  
Total $ 9,544,000 $ 9,887,000
Collateralized mortgage obligations    
Securities Available-for-Sale, Number of Securities    
Less than 12 months in an unrealized loss position | security 205 133
Greater than 12 months in an unrealized loss position | security 15  
Total 220 133
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 48,552,000 $ 2,285,000
Greater than 12 months in an unrealized loss position 11,651,000  
Total 60,203,000 2,285,000
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 505,601,000 381,658,000
Greater than 12 months in an unrealized loss position 77,102,000  
Total $ 582,703,000 $ 381,658,000
Asset-backed Securities    
Securities Available-for-Sale, Number of Securities    
Less than 12 months in an unrealized loss position | security 44 20
Greater than 12 months in an unrealized loss position | security 6 3
Total 50 23
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 6,553,000 $ 608,000
Greater than 12 months in an unrealized loss position 1,013,000 53,000
Total 7,566,000 661,000
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 196,221,000 103,819,000
Greater than 12 months in an unrealized loss position 11,524,000 3,276,000
Total $ 207,745,000 $ 107,095,000
Collateralized loan obligations.    
Securities Available-for-Sale, Number of Securities    
Less than 12 months in an unrealized loss position | security 26 10
Greater than 12 months in an unrealized loss position | security 8 2
Total 34 12
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 5,735,000 $ 35,000
Greater than 12 months in an unrealized loss position 1,338,000 43,000
Total 7,073,000 78,000
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 134,712,000 45,132,000
Greater than 12 months in an unrealized loss position 39,125,000 10,628,000
Total $ 173,837,000 $ 55,760,000