INVESTMENT SECURITIES (Amortized Cost and Estimated Fair Value of Investment Securities) (Details) - USD ($)	Dec. 31, 2025	Dec. 31, 2024
Amortized Cost
Due in one year or less	$ 825,000
Due after one year through five years	38,386,000
Due after five years through ten years	64,830,000
Due after ten years	137,337,000
Collateralized loan obligations	40,960,000
Amortized Cost	819,534,000	$ 843,774,000
Fair Value
Due in one year or less	817,000
Due after one year through five years	38,535,000
Due after five years through ten years	63,958,000
Due after ten years	113,756,000
Collateralized loan obligations	40,827,000
Fair Value	$ 748,212,000	737,658,000
Weighted Average Yield
Due in one year or less (in percent)	2.63%
Due after one year through five years (in percent)	4.12%
Due after five years through ten years (in percent)	3.81%
Due after ten years (in percent)	2.77%
Collateralized loan obligations	5.54%
Weighted Average Yield	3.22%
Amortized Cost
Due after ten years	$ 41,925,000
Amortized Cost	562,391,000	596,930,000
Fair Value
Due after ten years	34,699,000
Total held-to-maturity investment securities	$ 495,845,000	506,681,000
Weighted Average Yield
Due after ten years (in percent)	2.26%
Total held-to-maturity investment securities	1.91%
Investments	$ 1,381,925,000
Investment securities	$ 1,244,057,000
Total Investment Securities, Weighted Average Yield	0.0266
Residential - U.S. government-sponsored entities and agencies
Amortized Cost
Without single maturity date	$ 442,221,000
Amortized Cost	442,221,000	472,476,000
Fair Value
Without single maturity date	407,053,000
Fair Value	$ 407,053,000	414,471,000
Weighted Average Yield
Without single maturity date (in percent)	2.96%
Amortized Cost
Without single maturity date	$ 520,466,000
Amortized Cost	520,466,000	554,914,000
Fair Value
Without single maturity date	461,146,000
Total held-to-maturity investment securities	$ 461,146,000	473,549,000
Weighted Average Yield
Without single maturity date (in percent)	1.88%
Residential - Non-Government Agencies
Amortized Cost
Without single maturity date	$ 15,935,000
Amortized Cost	15,935,000	17,836,000
Fair Value
Without single maturity date	15,363,000
Fair Value	$ 15,363,000	16,926,000
Weighted Average Yield
Without single maturity date (in percent)	4.73%
Commercial - U.S. government-sponsored entities and agencies
Amortized Cost
Without single maturity date	$ 79,040,000
Amortized Cost	79,040,000	81,400,000
Fair Value
Without single maturity date	67,903,000
Fair Value	$ 67,903,000	67,161,000
Weighted Average Yield
Without single maturity date (in percent)	2.73%
Commercial - Non-government agencies
Amortized Cost
Amortized Cost		9,933,000
Fair Value
Fair Value		$ 9,927,000