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Securities - Unrealized Loss Positions (Details)
 3 Months Ended 6 Months Ended
Jun. 30, 2023
USD ($)
security
Jun. 30, 2023
USD ($)
security
Dec. 31, 2022
USD ($)
security
Securities Available-for-Sale, Number of Securities      
Less than 12 months in an unrealized loss position | security 42 42 194
Greater than 12 months in an unrealized loss position | security 377 377 299
Total 419 419 493
Securities Available-for-Sale, Unrealized Losses      
Less than 12 months in an unrealized loss position $ 2,280,000 $ 2,280,000 $ 27,304,000
Greater than 12 months in an unrealized loss position 110,665,000 110,665,000 96,526,000
Total 112,945,000 112,945,000 123,830,000
Securities Available-for-Sale, Fair Value      
Less than 12 months in an unrealized loss position 134,669,000 134,669,000 579,571,000
Greater than 12 months in an unrealized loss position 1,147,955,000 1,147,955,000 906,689,000
Total 1,282,624,000 $ 1,282,624,000 $ 1,486,260,000
Effective duration (in years)   3 years  
Credit losses were determined 0 $ 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     1
Greater than 12 months in an unrealized loss position | security 5 5 4
Total 5 5 5
Securities Available-for-Sale, Unrealized Losses      
Less than 12 months in an unrealized loss position     $ 1,025,000
Greater than 12 months in an unrealized loss position $ 9,724,000 $ 9,724,000 10,900,000
Total 9,724,000 9,724,000 11,925,000
Securities Available-for-Sale, Fair Value      
Less than 12 months in an unrealized loss position     24,121,000
Greater than 12 months in an unrealized loss position 214,613,000 214,613,000 188,008,000
Total $ 214,613,000 $ 214,613,000 $ 212,129,000
U.S. government agencies      
Securities Available-for-Sale, Number of Securities      
Greater than 12 months in an unrealized loss position | security 9 9 9
Total 9 9 9
Securities Available-for-Sale, Unrealized Losses      
Greater than 12 months in an unrealized loss position $ 4,612,000 $ 4,612,000 $ 5,130,000
Total 4,612,000 4,612,000 5,130,000
Securities Available-for-Sale, Fair Value      
Greater than 12 months in an unrealized loss position 55,981,000 55,981,000 56,048,000
Total $ 55,981,000 $ 55,981,000 $ 56,048,000
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 3 3 15
Greater than 12 months in an unrealized loss position | security 127 127 117
Total 130 130 132
Securities Available-for-Sale, Unrealized Losses      
Less than 12 months in an unrealized loss position $ 177,000 $ 177,000 $ 975,000
Greater than 12 months in an unrealized loss position 14,656,000 14,656,000 14,623,000
Total 14,833,000 14,833,000 15,598,000
Securities Available-for-Sale, Fair Value      
Less than 12 months in an unrealized loss position 2,188,000 2,188,000 11,369,000
Greater than 12 months in an unrealized loss position 112,952,000 112,952,000 113,621,000
Total $ 115,140,000 $ 115,140,000 $ 124,990,000
States and political subdivisions      
Securities Available-for-Sale, Number of Securities      
Less than 12 months in an unrealized loss position | security 31 31 45
Greater than 12 months in an unrealized loss position | security 26 26 15
Total 57 57 60
Securities Available-for-Sale, Unrealized Losses      
Less than 12 months in an unrealized loss position $ 1,178,000 $ 1,178,000 $ 5,800,000
Greater than 12 months in an unrealized loss position 11,609,000 11,609,000 8,434,000
Total 12,787,000 12,787,000 14,234,000
Securities Available-for-Sale, Fair Value      
Less than 12 months in an unrealized loss position 92,606,000 92,606,000 128,770,000
Greater than 12 months in an unrealized loss position 83,930,000 83,930,000 48,877,000
Total $ 176,536,000 $ 176,536,000 $ 177,647,000
Corporate bonds      
Securities Available-for-Sale, Number of Securities      
Greater than 12 months in an unrealized loss position | security 1 1 2
Total 1 1 2
Securities Available-for-Sale, Unrealized Losses      
Greater than 12 months in an unrealized loss position $ 118,000 $ 118,000 $ 378,000
Total 118,000 118,000 378,000
Securities Available-for-Sale, Fair Value      
Greater than 12 months in an unrealized loss position 4,882,000 4,882,000 9,622,000
Total $ 4,882,000 $ 4,882,000 $ 9,622,000
Collateralized mortgage obligations      
Securities Available-for-Sale, Number of Securities      
Less than 12 months in an unrealized loss position | security 3 3 80
Greater than 12 months in an unrealized loss position | security 149 149 120
Total 152 152 200
Securities Available-for-Sale, Unrealized Losses      
Less than 12 months in an unrealized loss position $ 381,000 $ 381,000 $ 12,895,000
Greater than 12 months in an unrealized loss position 60,153,000 60,153,000 49,674,000
Total 60,534,000 60,534,000 62,569,000
Securities Available-for-Sale, Fair Value      
Less than 12 months in an unrealized loss position 7,817,000 7,817,000 180,624,000
Greater than 12 months in an unrealized loss position 399,678,000 399,678,000 348,880,000
Total $ 407,495,000 $ 407,495,000 $ 529,504,000
Asset-backed Securities      
Securities Available-for-Sale, Number of Securities      
Less than 12 months in an unrealized loss position | security 4 4 30
Greater than 12 months in an unrealized loss position | security 27 27 21
Total 31 31 51
Securities Available-for-Sale, Unrealized Losses      
Less than 12 months in an unrealized loss position $ 536,000 $ 536,000 $ 3,030,000
Greater than 12 months in an unrealized loss position 5,936,000 5,936,000 5,436,000
Total 6,472,000 6,472,000 8,466,000
Securities Available-for-Sale, Fair Value      
Less than 12 months in an unrealized loss position 29,088,000 29,088,000 121,915,000
Greater than 12 months in an unrealized loss position 105,231,000 105,231,000 79,659,000
Total $ 134,319,000 $ 134,319,000 $ 201,574,000
Collateralized loan obligations.      
Securities Available-for-Sale, Number of Securities      
Less than 12 months in an unrealized loss position | security 1 1 23
Greater than 12 months in an unrealized loss position | security 33 33 11
Total 34 34 34
Securities Available-for-Sale, Unrealized Losses      
Less than 12 months in an unrealized loss position $ 8,000 $ 8,000 $ 3,579,000
Greater than 12 months in an unrealized loss position 3,857,000 3,857,000 1,951,000
Total 3,865,000 3,865,000 5,530,000
Securities Available-for-Sale, Fair Value      
Less than 12 months in an unrealized loss position 2,970,000 2,970,000 112,772,000
Greater than 12 months in an unrealized loss position 170,688,000 170,688,000 61,974,000
Total $ 173,658,000 $ 173,658,000 $ 174,746,000