CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 64,443,000	$ 66,555,000	$ 47,700,000
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization of premiums and accretion of discounts on securities	(4,822,000)	(953,000)	3,649,000
Gain on sale of SBA loans	(482,000)	(491,000)	(1,718,000)
Proceeds from sale of SBA loans originated for sale	8,035,000	7,689,000	18,324,000
SBA loans originated for sale	(7,302,000)	(7,767,000)	(17,274,000)
Provision for credit losses on loans	749,000	766,000	(3,134,000)
Increase in cash surrender value of life insurance	(2,031,000)	(1,925,000)	(1,838,000)
Depreciation and amortization	1,115,000	1,121,000	1,072,000
Amortization of other intangible assets	2,406,000	2,635,000	2,996,000
Stock option expense, net	600,000	595,000	579,000
RSUs and PRSUs expense	392,000
Amortization of restricted stock awards, net	1,404,000	2,583,000	1,940,000
Amortization of subordinated debt issuance costs	152,000	172,000	185,000
Gain on proceeds from company-owned life insurance	(125,000)	(27,000)	(675,000)
Effect of changes in:
Accrued interest receivable and other assets	2,411,000	978,000	6,127,000
Accrued interest payable and other liabilities	6,065,000	(2,078,000)	(1,084,000)
Net cash provided by operating activities	73,010,000	69,853,000	56,849,000
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase of securities available-for-sale		(425,721,000)
Purchase of securities held-to-maturity		(146,548,000)	(474,017,000)
Maturities/paydowns/calls of securities available-for-sale	59,014,000	21,881,000	129,191,000
Maturities/paydowns/calls of securities held-to-maturity	63,376,000	88,394,000	110,823,000
Purchase of mortgage loans		(185,426,000)	(405,752,000)
Net change in loans	(52,131,000)	(21,862,000)	(60,289,000)
Changes in FHLB stock and other investments	(18,000)	(18,000)	1,018,000
Proceeds from redemption of company-owned life insurance	1,612,000	596,000	2,447,000
Purchase of premises and equipment	(1,671,000)	(783,000)	(252,000)
Net cash provided by (used in) investing activities	70,182,000	(669,487,000)	(696,831,000)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net change in deposits	(11,146,000)	(369,808,000)	844,926,000
Exercise of stock options	1,220,000	2,050,000	1,469,000
Payment of cash dividends	(31,740,000)	(31,495,000)	(31,270,000)
Redemption of subordinated debt		(40,000,000)
Issuance of subordinated debt, net of issuance costs		39,274,000
Net cash (used in) provided by financing activities	(41,666,000)	(399,979,000)	815,125,000
Net increase (decrease) in cash and cash equivalents	101,526,000	(999,613,000)	175,143,000
Cash and cash equivalents, beginning of period	306,603,000	1,306,216,000	1,131,073,000
Cash and cash equivalents, end of period	408,129,000	306,603,000	1,306,216,000
Supplemental disclosures of cash flow information:
Interest paid	46,834,000	8,654,000	7,014,000
Income taxes paid, net	28,340,000	25,175,000	15,372,000
Supplemental schedule of non-cash activity:
Recording of right of use assets in exchange for lease obligations	$ 541,000	2,736,000	$ 2,977,000
Transfer of loans held-for-sale to loan portfolio		$ 480,000