CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 66,555,000	$ 47,700,000	$ 35,299,000
Adjustments to reconcile net income to net cash provided by operating activities:
Amortization of discounts and premiums on securities	(953,000)	3,649,000	3,747,000
Gain on sale of securities available-for-sale			(277,000)
Gain on sale of SBA loans	(491,000)	(1,718,000)	(839,000)
Proceeds from sale of SBA loans originated for sale	7,689,000	18,324,000	11,154,000
SBA loans originated for sale	(7,767,000)	(17,274,000)	(10,962,000)
Loss on the disposition of foreclosed assets			(791,000)
Provision for (recapture of) credit losses on loans	766,000	(3,134,000)	13,233,000
Increase in cash surrender value of life insurance	(1,925,000)	(1,838,000)	(1,845,000)
Depreciation and amortization	1,121,000	1,072,000	951,000
Amortization of other intangible assets	2,635,000	2,996,000	3,751,000
Stock option expense, net	595,000	579,000	559,000
Amortization of restricted stock awards, net	2,583,000	1,940,000	1,689,000
Amortization of subordinated debt issuance costs	172,000	185,000	186,000
Gain on proceeds from company-owned life insurance	(27,000)	(675,000)	(20,000)
Effect of changes in:
Accrued interest receivable and other assets	978,000	6,127,000	8,101,000
Accrued interest payable and other liabilities	(2,078,000)	(1,084,000)	(6,641,000)
Net cash provided by operating activities	69,853,000	56,849,000	57,295,000
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)	(30,916,000)
Maturities/paydowns/calls of securities available-for-sale	21,881,000	129,191,000	114,662,000
Maturities/paydowns/calls of securities held-to-maturity	88,394,000	110,823,000	97,365,000
Proceeds from sales of securities available-for-sale			56,598,000
Proceeds from the disposition of foreclosed assets			791,000
Purchase of mortgage loans	(185,426,000)	(405,752,000)
Net change in loans	(21,862,000)	(60,289,000)	(85,646,000)
Changes in Federal Home Loan Bank stock and other investments	(18,000)	1,018,000	(3,680,000)
Purchase of premises and equipment	(783,000)	(252,000)	(3,160,000)
Proceeds from redemption of company-owned life insurance	596,000	2,447,000	369,000
Net cash (used in) provided by investing activities	(669,487,000)	(696,831,000)	146,383,000
CASH FLOWS FROM FINANCING ACTIVITIES:
Net change in deposits	(369,808,000)	844,926,000	499,718,000
Net change in short-term borrowings			(328,000)
Exercise of stock options	2,050,000	1,469,000	1,714,000
Payment of cash dividends	(31,495,000)	(31,270,000)	(31,079,000)
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	(399,979,000)	815,125,000	470,025,000
Net (decrease) increase in cash and cash equivalents	(999,613,000)	175,143,000	673,703,000
Cash and cash equivalents, beginning of period	1,306,216,000	1,131,073,000	457,370,000
Cash and cash equivalents, end of period	306,603,000	1,306,216,000	1,131,073,000
Supplemental disclosures of cash flow information:
Interest paid	8,654,000	7,014,000	8,558,000
Income taxes paid, net	25,175,000	15,372,000	10,640,000
Supplemental schedule of non-cash activity:
Recording of right to use assets in exchange for lease obligations	2,736,000	$ 2,977,000	$ 26,654,000
Transfer of loans held-for-sale to loan portfolio	$ 480,000