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SECURITIES - Reclassifications out of AOCI into Earnings (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Securities available for sale    
Less than twelve months, gross unrealized losses $ 1,287 $ 1,576
Less than twelve months, fair value 180,826 130,805
Over twelve months, gross unrealized losses 1,000 24,115
Over twelve months, fair value 83,773 992,767
Total gross unrealized losses 2,287 25,691
Total fair value 264,599 1,123,572
Securities held to maturity    
Less than twelve months, gross unrealized losses 55 192
Less than twelve months, fair value 10,578 25,674
Over twelve months, gross unrealized losses 910 6,471
Over twelve months, fair value 6,925 170,459
Total gross unrealized losses 965 6,663
Total fair value 17,503 196,133
Securities available for sale and held to maturity    
Less than twelve months, gross unrealized losses 1,342 1,768
Less than twelve months, fair value 191,404 156,479
Over twelve months, gross unrealized losses 1,910 30,586
Over twelve months, fair value 90,698 1,163,226
Total gross unrealized losses 3,252 32,354
Total fair value 282,102 1,319,705
Debt securities | Agency collateralized mortgage obligations    
Securities available for sale    
Less than twelve months, gross unrealized losses 127 76
Less than twelve months, fair value 52,623 39,114
Over twelve months, gross unrealized losses 42 15,116
Over twelve months, fair value 6,267 755,528
Total gross unrealized losses 169 15,192
Total fair value 58,890 794,642
Securities held to maturity    
Less than twelve months, gross unrealized losses 50 0
Less than twelve months, fair value 9,778 0
Over twelve months, gross unrealized losses 0 778
Over twelve months, fair value 0 43,138
Total gross unrealized losses 50 778
Total fair value 9,778 43,138
Debt securities | Municipal bonds and obligations    
Securities available for sale    
Less than twelve months, gross unrealized losses   55
Less than twelve months, fair value   3,186
Over twelve months, gross unrealized losses   658
Over twelve months, fair value   11,787
Total gross unrealized losses   713
Total fair value   14,973
Securities held to maturity    
Less than twelve months, gross unrealized losses 5 127
Less than twelve months, fair value 800 17,596
Over twelve months, gross unrealized losses 0 3,474
Over twelve months, fair value 0 103,759
Total gross unrealized losses 5 3,601
Total fair value 800 121,355
Debt securities | Agency residential mortgage-backed securities    
Securities available for sale    
Less than twelve months, gross unrealized losses 59 53
Less than twelve months, fair value 10,640 5,500
Over twelve months, gross unrealized losses 301 5,068
Over twelve months, fair value 23,404 162,439
Total gross unrealized losses 360 5,121
Total fair value 34,044 167,939
Securities held to maturity    
Less than twelve months, gross unrealized losses   0
Less than twelve months, fair value   0
Over twelve months, gross unrealized losses   297
Over twelve months, fair value   6,922
Total gross unrealized losses   297
Total fair value   6,922
Debt securities | Agency commercial mortgage-backed securities    
Securities available for sale    
Less than twelve months, gross unrealized losses 1,097 44
Less than twelve months, fair value 116,324 1,503
Over twelve months, gross unrealized losses 49 3,231
Over twelve months, fair value 11,250 57,422
Total gross unrealized losses 1,146 3,275
Total fair value 127,574 58,925
Securities held to maturity    
Less than twelve months, gross unrealized losses   0
Less than twelve months, fair value   0
Over twelve months, gross unrealized losses   289
Over twelve months, fair value   10,128
Total gross unrealized losses   289
Total fair value   10,128
Debt securities | Corporate bonds    
Securities available for sale    
Less than twelve months, gross unrealized losses 0 1,348
Less than twelve months, fair value 0 81,502
Over twelve months, gross unrealized losses 607 7
Over twelve months, fair value 42,823 2,561
Total gross unrealized losses 607 1,355
Total fair value 42,823 84,063
Debt securities | Tax advantaged economic development bonds    
Securities held to maturity    
Less than twelve months, gross unrealized losses 0 65
Less than twelve months, fair value 0 8,078
Over twelve months, gross unrealized losses 910 1,633
Over twelve months, fair value 6,925 6,512
Total gross unrealized losses 910 1,698
Total fair value 6,925 14,590
Debt securities | Other bonds and obligations    
Securities available for sale    
Less than twelve months, gross unrealized losses 4 0
Less than twelve months, fair value 1,239 0
Over twelve months, gross unrealized losses 1 35
Over twelve months, fair value 29 3,030
Total gross unrealized losses 5 35
Total fair value $ 1,268 $ 3,030