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Securities - Unrealized Loss Positions (Details)
3 Months Ended
Jun. 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 476 241
Greater than 12 months in an unrealized loss position | security 20 11
Total 496 252
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 86,251,000 $ 4,230,000
Greater than 12 months in an unrealized loss position 4,588,000 885,000
Total 90,839,000 5,115,000
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 1,552,676,000 734,235,000
Greater than 12 months in an unrealized loss position 42,382,000 24,626,000
Total 1,595,058,000 $ 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 $ 8,948,000 $ 37,000
Total 8,948,000 37,000
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 214,820,000 49,719,000
Total $ 214,820,000 $ 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 $ 3,691,000 $ 592,000
Greater than 12 months in an unrealized loss position 86,000 107,000
Total 3,777,000 699,000
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 53,781,000 56,879,000
Greater than 12 months in an unrealized loss position 4,116,000 5,008,000
Total $ 57,897,000 $ 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 127 63
Greater than 12 months in an unrealized loss position | security 6 1
Total 133 64
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 9,681,000 $ 505,000
Greater than 12 months in an unrealized loss position 1,066,000 65,000
Total 10,747,000 570,000
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 136,686,000 78,711,000
Greater than 12 months in an unrealized loss position 5,149,000 1,663,000
Total $ 141,835,000 $ 80,374,000
States and political subdivisions    
Securities Available-for-Sale, Number of Securities    
Less than 12 months in an unrealized loss position | security 36 7
Greater than 12 months in an unrealized loss position | security 1 1
Total 37 8
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 10,463,000 $ 55,000
Greater than 12 months in an unrealized loss position 1,661,000 617,000
Total 12,124,000 672,000
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 119,482,000 8,430,000
Greater than 12 months in an unrealized loss position 2,941,000 4,051,000
Total $ 122,423,000 $ 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 $ 457,000 $ 113,000
Total 457,000 113,000
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 9,543,000 9,887,000
Total $ 9,543,000 $ 9,887,000
Collateralized mortgage obligations    
Securities Available-for-Sale, Number of Securities    
Less than 12 months in an unrealized loss position | security 221 133
Greater than 12 months in an unrealized loss position | security 2  
Total 223 133
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 38,780,000 $ 2,285,000
Greater than 12 months in an unrealized loss position 1,292,000  
Total 40,072,000 2,285,000
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 617,153,000 381,658,000
Greater than 12 months in an unrealized loss position 12,739,000  
Total $ 629,892,000 $ 381,658,000
Asset-backed Securities    
Securities Available-for-Sale, Number of Securities    
Less than 12 months in an unrealized loss position | security 48 20
Greater than 12 months in an unrealized loss position | security 5 3
Total 53 23
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 8,853,000 $ 608,000
Greater than 12 months in an unrealized loss position 294,000 53,000
Total 9,147,000 661,000
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 236,143,000 103,819,000
Greater than 12 months in an unrealized loss position 6,956,000 3,276,000
Total $ 243,099,000 $ 107,095,000
Collateralized loan obligations.    
Securities Available-for-Sale, Number of Securities    
Less than 12 months in an unrealized loss position | security 32 10
Greater than 12 months in an unrealized loss position | security 2 2
Total 34 12
Securities Available-for-Sale, Unrealized Losses    
Less than 12 months in an unrealized loss position $ 5,378,000 $ 35,000
Greater than 12 months in an unrealized loss position 189,000 43,000
Total 5,567,000 78,000
Securities Available-for-Sale, Fair Value    
Less than 12 months in an unrealized loss position 165,068,000 45,132,000
Greater than 12 months in an unrealized loss position 10,481,000 10,628,000
Total $ 175,549,000 $ 55,760,000