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INVESTMENTS - Summary of Held-To-Maturity and Available-For-Sale Investment Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Investment Holdings [Line Items] |  |
Total | $ 121,945 | $ 131,687
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 3,226 | 5,011
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (877) | 0
Held-to-Maturity Market Value | 124,294 | 136,698
Total | 3,698,779 | 3,330,029
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 82,242 | 99,942
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (27,258) | (5,391)
Investment securities available-for-sale | 3,753,763 | 3,424,580
U.S. Treasuries |  |
Investment Holdings [Line Items] |  |
Total | 0 | 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 | 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 0 | 0
Held-to-Maturity Market Value | 0 | 0
Total | 10,257 | 99
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 3 | 4
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | 0 | 0
Investment securities available-for-sale | 10,260 | 103
Securities of U.S. government agencies and corporations |  |
Investment Holdings [Line Items] |  |
Total |  | 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain |  | 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss |  | 0
Held-to-Maturity Market Value |  | 0
Total |  | 60
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments |  | 0
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments |  | 0
Investment securities available-for-sale |  | 60
Residential Mortgage Backed Securities [Member] |  |
Investment Holdings [Line Items] |  |
Total | 0 | 13,990
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 | 197
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 0 | 0
Held-to-Maturity Market Value | 0 | 14,187
Total | 784,407 | 704,482
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 12,488 | 15,938
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (11,255) | (237)
Investment securities available-for-sale | 785,640 | 720,183
Commercial Mortgage Backed Securities [Member] |  |
Investment Holdings [Line Items] |  |
Total | 63,481 | 71,737
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 2,034 | 3,485
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 0 | 0
Held-to-Maturity Market Value | 65,515 | 75,222
Total | 591,629 | 584,125
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 7,096 | 10,395
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (3,680) | (3,584)
Investment securities available-for-sale | 595,045 | 590,936
Collateralized Mortgage Backed Securities [Member] |  |
Investment Holdings [Line Items] |  |
Total | 17,580 | 5,799
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 109 | 79
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (411) | 0
Held-to-Maturity Market Value | 17,278 | 5,878
Total | 661,322 | 634,418
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 17,796 | 21,148
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (2,404) | (445)
Investment securities available-for-sale | 676,714 | 655,121
Obligations of state and other political subdivisions |  |
Investment Holdings [Line Items] |  |
Total | 9,634 | 9,911
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 1,001 | 1,239
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 0 | 0
Held-to-Maturity Market Value | 10,635 | 11,150
Total | 971,325 | 856,054
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 38,835 | 46,755
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (8,541) | (291)
Investment securities available-for-sale | 1,001,619 | 902,518
Asset-backed Securities [Member] |  |
Investment Holdings [Line Items] |  |
Total | 0 | 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 0 | 0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 0 | 0
Held-to-Maturity Market Value | 0 | 0
Total | 601,836 | 478,539
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 4,075 | 4,158
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (1,190) | (826)
Investment securities available-for-sale | 604,721 | 481,871
Other securities |  |
Investment Holdings [Line Items] |  |
Total | 31,250 | 30,250
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 82 | 11
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | (466) | 0
Held-to-Maturity Market Value | 30,866 | 30,261
Total | 78,003 | 72,252
Available for Sale Securities Gross Unrealized Gain Accumulated In Investments | 1,949 | 1,544
Available for Sale Securities Gross Unrealized Loss Accumulated In Investments | (188) | (8)
Investment securities available-for-sale | $ 79,764 | $ 73,788

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