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INVESTMENT SECURITIES - Weighted Average Yield (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
AVAILABLE FOR SALE
Fair value	$ 1,002,522	$ 1,072,093
Municipal bonds
AVAILABLE FOR SALE
Due within one year or less, Fair value	4,933	4,024
Due after one year through five years, Fair value	14,366	14,978
Due after five years through ten years, Fair value	68,025	59,496
Due after ten years, Fair value	452,599	486,205
Fair value	$ 539,923	$ 564,703
Due in one year or less, Weighted Average Yield	3.79%	3.19%
Due after one year through five years, Weighted Average Yield	3.26%	3.82%
Due after five years through ten years, Weighted Average Yield	3.60%	3.26%
Due after ten years, Weighted Average Yield	3.23%	3.29%
Weighted average yield	3.28%	3.30%
Held-to-maturity Securities
Due within one year or less, Fair value	$ 1,684	$ 0
Due after one year through five years, Fair value	2,621	4,507
Due after five years through ten years, Fair value	0	0
Due after ten years, Fair value	0	0
Fair Value	$ 4,305	$ 4,507
Due in one year or less, Weighted Average Yield	2.86%	0.00%
Due after one year through five years, Weighted Average Yield	2.12%	2.47%
Due after five years through ten years, Weighted Average Yield	0.00%	0.00%
Due after ten years, Weighted Average Yield	0.00%	0.00%
Weighted average yield	2.42%	2.47%
Corporate debt securities
AVAILABLE FOR SALE
Due within one year or less, Fair value	$ 0	$ 183
Due after one year through five years, Fair value	6,563	7,059
Due after five years through ten years, Fair value	13,053	7,980
Due after ten years, Fair value	0	0
Fair value	$ 19,616	$ 15,222
Due in one year or less, Weighted Average Yield	0.00%	4.27%
Due after one year through five years, Weighted Average Yield	3.60%	3.74%
Due after five years through ten years, Weighted Average Yield	5.03%	4.78%
Due after ten years, Weighted Average Yield	0.00%	0.00%
Weighted average yield	4.55%	4.30%
Agency debentures
AVAILABLE FOR SALE
Due within one year or less, Fair value		$ 0
Due after one year through five years, Fair value		0
Due after five years through ten years, Fair value		0
Due after ten years, Fair value		1,846
Fair value		$ 1,846
Due in one year or less, Weighted Average Yield		0.00%
Due after one year through five years, Weighted Average Yield		0.00%
Due after five years through ten years, Weighted Average Yield		0.00%
Due after ten years, Weighted Average Yield		2.68%
Weighted average yield		2.68%
U.S. Treasury securities
AVAILABLE FOR SALE
Due within one year or less, Fair value	$ 0
Due after one year through five years, Fair value	0
Due after five years through ten years, Fair value	23,175
Due after ten years, Fair value	0
Fair value	$ 23,175
Due in one year or less, Weighted Average Yield	0.00%
Due after one year through five years, Weighted Average Yield	0.00%
Due after five years through ten years, Weighted Average Yield	1.27%
Due after ten years, Weighted Average Yield	0.00%
Weighted average yield	1.27%
Municipal Bonds, Corporate Debt Securities, US Treasury Securities
AVAILABLE FOR SALE
Due within one year or less, Fair value	$ 4,933
Due after one year through five years, Fair value	20,929
Due after five years through ten years, Fair value	104,253
Due after ten years, Fair value	452,599
Fair value	$ 582,714
Due in one year or less, Weighted Average Yield	3.79%
Due after one year through five years, Weighted Average Yield	3.37%
Due after five years through ten years, Weighted Average Yield	3.23%
Due after ten years, Weighted Average Yield	3.23%
Weighted average yield	3.24%
Municipal Bonds, Corporate Debt Securities, Agency Debentures
AVAILABLE FOR SALE
Due within one year or less, Fair value		$ 4,207
Due after one year through five years, Fair value		22,037
Due after five years through ten years, Fair value		67,476
Due after ten years, Fair value		488,051
Fair value		$ 581,771
Due in one year or less, Weighted Average Yield		3.24%
Due after one year through five years, Weighted Average Yield		3.80%
Due after five years through ten years, Weighted Average Yield		3.45%
Due after ten years, Weighted Average Yield		3.29%
Weighted average yield		3.33%

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