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Securities - Schedule of Securities with Unrealized Losses (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]    
Less than 12 Months, Fair Value $ 165,489 $ 1,018,313
Less than 12 Months, Unrealized Loss (7,776) (177,161)
12 Months or More, Fair Value 1,409,155 603,633
12 Months or More, Unrealized Loss (284,837) (156,691)
Total Fair Value 1,574,644 1,621,946
Total Unrealized Loss (292,613) (333,852)
U.S. Treasury    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 Months, Fair Value 0 0
Less than 12 Months, Unrealized Loss 0 0
12 Months or More, Fair Value 0 0
12 Months or More, Unrealized Loss 0 0
Total Fair Value 0 0
Total Unrealized Loss 0 0
Obligations of State and Political Subdivisions    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 Months, Fair Value 89,866 579,267
Less than 12 Months, Unrealized Loss (3,578) (117,423)
12 Months or More, Fair Value 597,155 122,992
12 Months or More, Unrealized Loss (134,669) (44,591)
Total Fair Value 687,021 702,259
Total Unrealized Loss (138,247) (162,014)
MBS/CMO    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 Months, Fair Value 64,508 240,344
Less than 12 Months, Unrealized Loss (3,421) (20,920)
12 Months or More, Fair Value 627,839 474,327
12 Months or More, Unrealized Loss (116,121) (110,918)
Total Fair Value 692,347 714,671
Total Unrealized Loss (119,542) (131,838)
US Gov’t Sponsored Entities & Agencies    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 Months, Fair Value 11,115 198,702
Less than 12 Months, Unrealized Loss (777) (38,818)
12 Months or More, Fair Value 184,161 6,314
12 Months or More, Unrealized Loss (34,047) (1,182)
Total Fair Value 195,276 205,016
Total Unrealized Loss $ (34,824) $ (40,000)