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INVESTMENT SECURITIES - Composition, Repricing and Yield Information of Investment Securities Portfolio (Details) $ in Thousands	Jun. 30, 2022 USD ($)
Fair Value
One year or less	$ 0
More than One Year through Five Years	0
More than Five Years through Ten Years	17,134
More than Ten Years	268,538
Total	$ 285,672
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	2.19%
More than Ten Years	2.68%
Total	2.66%
Fair Value
One year or less	$ 577,867
More than One Year through Five Years	159,271
More than Five Years through Ten Years	60,513
More than Ten Years	67,784
Total	$ 865,435
Weighted-Average Yield
One year or less	2.52%
More than One Year through Five Years	4.56%
More than Five Years through Ten Years	2.52%
More than Ten Years	2.29%
Total	2.87%
SBA loan pool securities
Fair Value
One year or less	$ 13,062
More than One Year through Five Years	0
More than Five Years through Ten Years	0
More than Ten Years	0
Total	$ 13,062
Weighted-Average Yield
One year or less	1.06%
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	1.06%
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	135,287
Total	$ 135,287
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	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	11,365
More than Ten Years	0
Total	$ 11,365
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	53,396
Total	$ 53,396
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	$ 86,602
More than One Year through Five Years	9,630
More than Five Years through Ten Years	35,518
More than Ten Years	22,303
Total	$ 154,053
Weighted-Average Yield
One year or less	1.73%
More than One Year through Five Years	2.24%
More than Five Years through Ten Years	1.55%
More than Ten Years	1.81%
Total	1.73%
Municipal securities
Fair Value
One year or less	$ 0
More than One Year through Five Years	0
More than Five Years through Ten Years	17,134
More than Ten Years	79,855
Total	$ 96,989
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	2.19%
More than Ten Years	2.71%
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	45,481
Total	$ 45,481
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	$ 478,203
More than One Year through Five Years	0
More than Five Years through Ten Years	0
More than Ten Years	0
Total	$ 478,203
Weighted-Average Yield
One year or less	2.70%
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	2.70%
Corporate debt securities
Fair Value
One year or less	$ 0
More than One Year through Five Years	149,641
More than Five Years through Ten Years	13,630
More than Ten Years	0
Total	$ 163,271
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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