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INVESTMENT SECURITIES - Composition, Repricing and Yield Information of Investment Securities Portfolio (Details)
$ in Thousands
Sep. 30, 2023
USD ($)
Fair Value  
One year or less $ 497,569
More than One Year through Five Years 150,580
More than Five Years through Ten Years 34,950
More than Ten Years 231,955
Total $ 915,054
Weighted-Average Yield  
One year or less 7.16%
More than One Year through Five Years 4.76%
More than Five Years through Ten Years 4.04%
More than Ten Years 4.74%
Total 5.97%
Amortized Cost  
One year or less $ 0
More than One Year through Five Years 0
More than Five Years through Ten Years 37,305
More than Ten Years 290,982
Total $ 328,287
Weighted-Average Yield  
One year or less 0.00%
More than One Year through Five Years 0.00%
More than Five Years through Ten Years 2.37%
More than Ten Years 2.69%
Total 2.65%
SBA loan pool securities  
Fair Value  
One year or less $ 8,699
More than One Year through Five Years 0
More than Five Years through Ten Years 0
More than Ten Years 0
Total $ 8,699
Weighted-Average Yield  
One year or less 5.79%
More than One Year through Five Years 0.00%
More than Five Years through Ten Years 0.00%
More than Ten Years 0.00%
Total 5.79%
U.S. government agency and U.S. government sponsored enterprise residential mortgage-backed securities  
Fair Value  
One year or less $ 0
More than One Year through Five Years 0
More than Five Years through Ten Years 0
More than Ten Years 76,844
Total $ 76,844
Weighted-Average Yield  
One year or less 0.00%
More than One Year through Five Years 0.00%
More than Five Years through Ten Years 0.00%
More than Ten Years 5.52%
Total 5.52%
Amortized Cost  
One year or less $ 0
More than One Year through Five Years 0
More than Five Years through Ten Years 9,334
More than Ten Years 143,414
Total $ 152,748
Weighted-Average Yield  
One year or less 0.00%
More than One Year through Five Years 0.00%
More than Five Years through Ten Years 2.52%
More than Ten Years 2.70%
Total 2.69%
U.S. government agency and U.S. government sponsored enterprise collateralized mortgage obligations  
Fair Value  
One year or less $ 5,066
More than One Year through Five Years 7,528
More than Five Years through Ten Years 23,087
More than Ten Years 50,151
Total $ 85,832
Weighted-Average Yield  
One year or less 5.98%
More than One Year through Five Years 3.72%
More than Five Years through Ten Years 3.25%
More than Ten Years 5.21%
Total 4.52%
Amortized Cost  
One year or less $ 0
More than One Year through Five Years 0
More than Five Years through Ten Years 0
More than Ten Years 61,337
Total $ 61,337
Weighted-Average Yield  
One year or less 0.00%
More than One Year through Five Years 0.00%
More than Five Years through Ten Years 0.00%
More than Ten Years 2.64%
Total 2.64%
Non-agency residential mortgage-backed securities  
Fair Value  
One year or less $ 0
More than One Year through Five Years 0
More than Five Years through Ten Years 0
More than Ten Years 104,960
Total $ 104,960
Weighted-Average Yield  
One year or less 0.00%
More than One Year through Five Years 0.00%
More than Five Years through Ten Years 0.00%
More than Ten Years 4.02%
Total 4.02%
Collateralized loan obligations  
Fair Value  
One year or less $ 483,804
More than One Year through Five Years 0
More than Five Years through Ten Years 0
More than Ten Years 0
Total $ 483,804
Weighted-Average Yield  
One year or less 7.20%
More than One Year through Five Years 0.00%
More than Five Years through Ten Years 0.00%
More than Ten Years 0.00%
Total 7.20%
Corporate debt securities  
Fair Value  
One year or less $ 0
More than One Year through Five Years 143,052
More than Five Years through Ten Years 11,863
More than Ten Years 0
Total $ 154,915
Weighted-Average Yield  
One year or less 0.00%
More than One Year through Five Years 4.82%
More than Five Years through Ten Years 5.73%
More than Ten Years 0.00%
Total 4.89%
Municipal securities  
Amortized Cost  
One year or less $ 0
More than One Year through Five Years 0
More than Five Years through Ten Years 27,971
More than Ten Years 86,231
Total $ 114,202
Weighted-Average Yield  
One year or less 0.00%
More than One Year through Five Years 0.00%
More than Five Years through Ten Years 2.32%
More than Ten Years 2.72%
Total 2.62%