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INVESTMENT SECURITIES - Composition, Repricing and Yield Information of Investment Securities Portfolio (Details) $ in Thousands	Mar. 31, 2022 USD ($)
Fair Value
One year or less	$ 0
More than One Year through Five Years	0
More than Five Years through Ten Years	14,143
More than Ten Years	296,809
Total	$ 310,952
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	2.20%
More than Ten Years	2.68%
Total	2.66%
Fair Value
One year or less	$ 596,427
More than One Year through Five Years	163,524
More than Five Years through Ten Years	64,402
More than Ten Years	74,422
Total	$ 898,775
Weighted-Average Yield
One year or less	1.68%
More than One Year through Five Years	4.54%
More than Five Years through Ten Years	2.39%
More than Ten Years	2.27%
Total	2.29%
SBA loan pool securities
Fair Value
One year or less	$ 13,810
More than One Year through Five Years	0
More than Five Years through Ten Years	0
More than Ten Years	0
Total	$ 13,810
Weighted-Average Yield
One year or less	0.98%
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	0.98%
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	145,881
Total	$ 145,881
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	2.69%
Total	2.69%
Fair Value
One year or less	$ 0
More than One Year through Five Years	0
More than Five Years through Ten Years	11,733
More than Ten Years	0
Total	$ 11,733
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	2.23%
More than Ten Years	0.00%
Total	2.23%
U.S. government agency and U.S. government sponsored enterprise collateralized mortgage obligations
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	57,818
Total	$ 57,818
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%
Fair Value
One year or less	$ 94,644
More than One Year through Five Years	9,923
More than Five Years through Ten Years	37,688
More than Ten Years	23,960
Total	$ 166,215
Weighted-Average Yield
One year or less	0.80%
More than One Year through Five Years	1.98%
More than Five Years through Ten Years	1.36%
More than Ten Years	1.74%
Total	1.14%
Municipal securities
Fair Value
One year or less	$ 0
More than One Year through Five Years	0
More than Five Years through Ten Years	14,143
More than Ten Years	93,110
Total	$ 107,253
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	2.20%
More than Ten Years	2.68%
Total	2.62%
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	50,462
Total	$ 50,462
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	2.51%
Total	2.51%
Collateralized loan obligations
Fair Value
One year or less	$ 487,973
More than One Year through Five Years	0
More than Five Years through Ten Years	0
More than Ten Years	0
Total	$ 487,973
Weighted-Average Yield
One year or less	1.87%
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	1.87%
Corporate debt securities
Fair Value
One year or less	$ 0
More than One Year through Five Years	153,601
More than Five Years through Ten Years	14,981
More than Ten Years	0
Total	$ 168,582
Weighted-Average Yield
One year or less	0.00%
More than One Year through Five Years	4.71%
More than Five Years through Ten Years	5.73%
More than Ten Years	0.00%
Total	4.80%

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