DEBT SECURITIES - Gross unrealized losses aggregated by category (Details) $ in Thousands	9 Months Ended
Sep. 30, 2022 USD ($) security	Dec. 31, 2021 USD ($)
Continuous unrealized losses, Gross Unrealized Losses, Available-for-Sale
Less than Twelve Months	$ 11,322	$ 3,718
Twelve Months and Over	59,120	1,035
Continuous unrealized losses, Fair Value, Available-for-Sale
Less Than Twelve Months	77,309	304,154
Twelve Months and Over	$ 227,506	35,552
Continuous unrealized losses, Fair Value, Held-for-Maturity
Number of debt securities \| security	131
Number of debt securities in unrealized loss position \| security	130
U.S. government agency and government-sponsored residential mortgage-backed securities
Continuous unrealized losses, Gross Unrealized Losses, Available-for-Sale
Less than Twelve Months	$ 10,653	2,835
Twelve Months and Over	50,749	1,035
Continuous unrealized losses, Fair Value, Available-for-Sale
Less Than Twelve Months	66,455	262,889
Twelve Months and Over	193,735	35,552
U.S. government-sponsored collateralized mortgage obligations
Continuous unrealized losses, Gross Unrealized Losses, Available-for-Sale
Less than Twelve Months	105
Continuous unrealized losses, Fair Value, Available-for-Sale
Less Than Twelve Months	2,733
SBA asset-backed securities
Continuous unrealized losses, Gross Unrealized Losses, Available-for-Sale
Less than Twelve Months	195
Continuous unrealized losses, Fair Value, Available-for-Sale
Less Than Twelve Months	2,490
U.S. government and government-sponsored enterprise obligations
Continuous unrealized losses, Gross Unrealized Losses, Available-for-Sale
Less than Twelve Months	229	883
Twelve Months and Over	8,371
Continuous unrealized losses, Fair Value, Available-for-Sale
Less Than Twelve Months	4,771	$ 41,265
Twelve Months and Over	33,771
Continuous unrealized losses, Gross Unrealized Losses, Held-to-Maturity
Less than Twelve Months	549
Continuous unrealized losses, Fair Value, Held-for-Maturity
Less Than Twelve Months	14,451
Corporate bonds
Continuous unrealized losses, Gross Unrealized Losses, Available-for-Sale
Less than Twelve Months	140
Continuous unrealized losses, Fair Value, Available-for-Sale
Less Than Twelve Months	$ 860

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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