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INVESTMENT SECURITIES - Composition, Repricing and Yield Information of Investment Securities Portfolio (Details) $ in Thousands	Sep. 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	24,157
More than Ten Years	239,195
Total	$ 263,352
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	2.29%
More than Ten Years	2.69%
Total	2.65%
Fair Value
One year or less	$ 564,436
More than One Year through Five Years	164,704
More than Five Years through Ten Years	56,549
More than Ten Years	61,876
Total	$ 847,565
Weighted-Average Yield
One year or less	4.03%
More than One Year through Five Years	4.71%
More than Five Years through Ten Years	2.76%
More than Ten Years	2.30%
Total	3.93%
SBA loan pool securities
Fair Value
One year or less	$ 12,106
More than One Year through Five Years	0
More than Five Years through Ten Years	0
More than Ten Years	0
Total	$ 12,106
Weighted-Average Yield
One year or less	1.82%
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	1.82%
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	7,960
More than Ten Years	115,989
Total	$ 123,949
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%
Fair Value
One year or less	$ 0
More than One Year through Five Years	0
More than Five Years through Ten Years	10,696
More than Ten Years	0
Total	$ 10,696
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	49,476
Total	$ 49,476
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	$ 79,654
More than One Year through Five Years	8,138
More than Five Years through Ten Years	33,003
More than Ten Years	20,362
Total	$ 141,157
Weighted-Average Yield
One year or less	3.16%
More than One Year through Five Years	2.72%
More than Five Years through Ten Years	1.92%
More than Ten Years	1.83%
Total	2.61%
Municipal securities
Fair Value
One year or less	$ 0
More than One Year through Five Years	0
More than Five Years through Ten Years	16,197
More than Ten Years	73,730
Total	$ 89,927
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	41,514
Total	$ 41,514
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	2.50%
Total	2.50%
Collateralized loan obligations
Fair Value
One year or less	$ 472,676
More than One Year through Five Years	0
More than Five Years through Ten Years	0
More than Ten Years	0
Total	$ 472,676
Weighted-Average Yield
One year or less	4.23%
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	4.23%
Corporate debt securities
Fair Value
One year or less	$ 0
More than One Year through Five Years	156,566
More than Five Years through Ten Years	12,850
More than Ten Years	0
Total	$ 169,416
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%

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