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SECURITIES AVAILABLE FOR SALE, HELD TO MATURITY, AND MARKETABLE EQUITY SECURITIES - Summary of Securities with Unrealized Losses (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Securities available for sale, Gross Unrealized Losses    
Less Than Twelve Months $ 101,697 $ 14,528
Over Twelve Months 146,655 7,868
Total 248,352 22,396
Securities available for sale, Fair Value    
Less Than Twelve Months 849,913 712,488
Over Twelve Months 591,350 252,279
Total 1,441,263 964,767
Gross Unrealized Losses    
Less Than Twelve Months 29,109 4,610
Over Twelve Months 60,436 4,398
Total 89,545 9,008
Fair Value    
Less Than Twelve Months 246,814 194,606
Over Twelve Months 213,572 113,891
Over Twelve Months 460,386 308,497
Securities available for sale and held to maturity    
Held to maturity and available for sale securities continuous unrealized loss position, less than twelve months, aggregate losses 130,806 19,138
Held to maturity and available for sale securities continuous unrealized loss position, less than twelve months, fair value 1,096,727 907,094
Held to maturity and available for sale securities continuous unrealized loss position, over twelve months, aggregate losses 207,091 12,266
Held to maturity and available for sale securities continuous unrealized loss position, over twelve months, fair value 804,922 366,170
Held to maturity and available for sale securities continuous unrealized loss position, aggregate losses 337,897 31,404
Held to maturity and available for sale securities continuous unrealized loss position, fair value 1,901,649 1,273,264
U.S Treasuries    
Securities available for sale, Gross Unrealized Losses    
Less Than Twelve Months 0  
Over Twelve Months 0  
Total 0  
Securities available for sale, Fair Value    
Less Than Twelve Months 0  
Over Twelve Months 0  
Total 0  
Municipal bonds and obligations    
Securities available for sale, Gross Unrealized Losses    
Less Than Twelve Months 5,854  
Over Twelve Months 0  
Total 5,854  
Securities available for sale, Fair Value    
Less Than Twelve Months 52,279  
Over Twelve Months 0  
Total 52,279  
Gross Unrealized Losses    
Less Than Twelve Months 22,075 693
Over Twelve Months 14,371 0
Total 36,446 693
Fair Value    
Less Than Twelve Months 166,539 36,981
Over Twelve Months 23,286 0
Over Twelve Months 189,825 36,981
Agency collateralized mortgage obligations    
Securities available for sale, Gross Unrealized Losses    
Less Than Twelve Months 26,129 9,626
Over Twelve Months 72,490 1,386
Total 98,619 11,012
Securities available for sale, Fair Value    
Less Than Twelve Months 293,758 375,132
Over Twelve Months 263,754 27,025
Total 557,512 402,157
Gross Unrealized Losses    
Less Than Twelve Months 2,537 1,808
Over Twelve Months 17,428 1,705
Total 19,965 3,513
Fair Value    
Less Than Twelve Months 52,558 49,308
Over Twelve Months 60,408 36,212
Over Twelve Months 112,966 85,520
Agency mortgage-backed securities    
Securities available for sale, Gross Unrealized Losses    
Less Than Twelve Months 48,764 3,179
Over Twelve Months 57,565 4,463
Total 106,329 7,642
Securities available for sale, Fair Value    
Less Than Twelve Months 314,987 222,887
Over Twelve Months 238,651 175,941
Total 553,638 398,828
Gross Unrealized Losses    
Less Than Twelve Months 340 839
Over Twelve Months 9,993 659
Total 10,333 1,498
Fair Value    
Less Than Twelve Months 2,410 26,656
Over Twelve Months 39,432 26,025
Over Twelve Months 41,842 52,681
Agency commercial mortgage-backed securities    
Securities available for sale, Gross Unrealized Losses    
Less Than Twelve Months 19,323 1,609
Over Twelve Months 15,710 2,019
Total 35,033 3,628
Securities available for sale, Fair Value    
Less Than Twelve Months 154,763 103,354
Over Twelve Months 80,799 49,313
Total 235,562 152,667
Gross Unrealized Losses    
Less Than Twelve Months 4,156 1,255
Over Twelve Months 18,503 2,034
Total 22,659 3,289
Fair Value    
Less Than Twelve Months 25,094 80,406
Over Twelve Months 89,423 51,654
Over Twelve Months 114,517 132,060
Corporate bonds    
Securities available for sale, Gross Unrealized Losses    
Less Than Twelve Months 1,627 114
Over Twelve Months 824 0
Total 2,451 114
Securities available for sale, Fair Value    
Less Than Twelve Months 34,126 11,115
Over Twelve Months 7,851 0
Total 41,977 11,115
Other bonds and obligations    
Securities available for sale, Gross Unrealized Losses    
Less Than Twelve Months 0  
Over Twelve Months 66  
Total 66  
Securities available for sale, Fair Value    
Less Than Twelve Months 0  
Over Twelve Months 295  
Total 295  
Gross Unrealized Losses    
Total 0 0
Tax advantaged economic development bonds    
Gross Unrealized Losses    
Less Than Twelve Months 1 15
Over Twelve Months 141 0
Total 142 15
Fair Value    
Less Than Twelve Months 213 1,255
Over Twelve Months 1,023 0
Over Twelve Months $ 1,236 $ 1,255