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INVESTMENT SECURITIES - Composition, Repricing and Yield Information of Investment Securities (Details)
$ in Thousands
Dec. 31, 2020
USD ($)
Debt Securities, Available-for-sale [Line Items]  
One year or less $ 808,366
One year or less (percent) 1.70%
More than One Year through Five Years $ 143,267
More than One Year through Five Years (percent) 4.77%
More than Five Years through Ten Years $ 101,615
More than Five Years through Ten Years (percent) 2.40%
More than Ten Years $ 178,183
More than Ten Years (percent) 1.93%
Total $ 1,231,431
Total (percent) 2.14%
SBA loan pools securities  
Debt Securities, Available-for-sale [Line Items]  
One year or less $ 17,354
One year or less (percent) 1.71%
More than One Year through Five Years $ 0
More than One Year through Five Years (percent) 0.00%
More than Five Years through Ten Years $ 0
More than Five Years through Ten Years (percent) 0.00%
More than Ten Years $ 0
More than Ten Years (percent) 0.00%
Total $ 17,354
Total (percent) 1.71%
U.S. government agency and U.S. government sponsored enterprise residential mortgage-backed securities  
Debt Securities, Available-for-sale [Line Items]  
One year or less $ 0
One year or less (percent) 0.00%
More than One Year through Five Years $ 0
More than One Year through Five Years (percent) 0.00%
More than Five Years through Ten Years $ 30,243
More than Five Years through Ten Years (percent) 2.20%
More than Ten Years $ 76,141
More than Ten Years (percent) 2.35%
Total $ 106,384
Total (percent) 2.31%
U.S. government agency and U.S. government sponsored enterprise collateralized mortgage obligations  
Debt Securities, Available-for-sale [Line Items]  
One year or less $ 113,227
One year or less (percent) 0.71%
More than One Year through Five Years $ 11,438
More than One Year through Five Years (percent) 2.01%
More than Five Years through Ten Years $ 44,451
More than Five Years through Ten Years (percent) 1.36%
More than Ten Years $ 42,715
More than Ten Years (percent) 0.31%
Total $ 211,831
Total (percent) 0.83%
Municipal securities  
Debt Securities, Available-for-sale [Line Items]  
One year or less $ 0
One year or less (percent) 0.00%
More than One Year through Five Years $ 0
More than One Year through Five Years (percent) 0.00%
More than Five Years through Ten Years $ 9,456
More than Five Years through Ten Years (percent) 2.60%
More than Ten Years $ 59,167
More than Ten Years (percent) 2.62%
Total $ 68,623
Total (percent) 2.62%
Non-agency residential mortgage-backed securities  
Debt Securities, Available-for-sale [Line Items]  
One year or less $ 0
One year or less (percent) 0.00%
More than One Year through Five Years $ 0
More than One Year through Five Years (percent) 0.00%
More than Five Years through Ten Years $ 0
More than Five Years through Ten Years (percent) 0.00%
More than Ten Years $ 160
More than Ten Years (percent) 6.35%
Total $ 160
Total (percent) 6.35%
Collateralized loan obligations  
Debt Securities, Available-for-sale [Line Items]  
One year or less $ 677,785
One year or less (percent) 1.86%
More than One Year through Five Years $ 0
More than One Year through Five Years (percent) 0.00%
More than Five Years through Ten Years $ 0
More than Five Years through Ten Years (percent) 0.00%
More than Ten Years $ 0
More than Ten Years (percent) 0.00%
Total $ 677,785
Total (percent) 1.86%
Corporate debt securities  
Debt Securities, Available-for-sale [Line Items]  
One year or less $ 0
One year or less (percent) 0.00%
More than One Year through Five Years $ 131,829
More than One Year through Five Years (percent) 5.01%
More than Five Years through Ten Years $ 17,465
More than Five Years through Ten Years (percent) 5.73%
More than Ten Years $ 0
More than Ten Years (percent) 0.00%
Total $ 149,294
Total (percent) 5.08%