Consolidated Statements of Cash Flows - USD ($)		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Cash Flows from Operating Activities:
Net income		$ 95,041,000	$ 57,518,000	$ 70,672,000
Adjustments to reconcile net income to net cash provided by operating activities:
Net (accretion) amortization of premiums, discounts and deferred loan fees and costs		(3,981,000)	(728,000)	3,660,000
Depreciation and amortization		5,126,000	3,858,000	1,645,000
Amortization of intangible assets		868,000	1,025,000	1,182,000
Amortization of operating lease right-of-use assets		2,267,000	2,668,000	2,592,000
Provision for loan losses	[1]	(10,896,000)	27,222,000	2,130,000
Stock-based compensation		4,073,000	2,659,000	2,545,000
Loans originated for sale		(56,956,000)	(113,203,000)	(57,605,000)
Proceeds from sales of loans held for sale		58,612,000	116,933,000	59,748,000
Gains on investment securities transactions, net		(9,000)	(1,213,000)	0
Gains on sales of loans held for sale		(2,264,000)	(3,322,000)	(1,660,000)
Income on bank owned life insurance		(2,550,000)	(2,657,000)	(2,740,000)
Gain on death benefit from bank owned life insurance		(126,000)	0	0
Change in fair value of equity securities		285,000	552,000	(496,000)
(Gains) losses on other real estate and other repossessed assets		(32,000)	(88,000)	72,000
Loss on sale of premises and equipment		281,000	77,000	497,000
Long-term debt prepayment penalty		0	4,133,000	0
Long-term debt extinguishment costs		831,000	0	0
Deferred tax expense (benefit)		5,422,000	(6,763,000)	2,854,000
Excess tax (deficiencies) benefits		(89,000)	(132,000)	189,000
Decrease (increase) in other assets		36,589,000	(53,982,000)	(13,246,000)
(Decrease) increase in other liabilities		(37,389,000)	50,434,000	15,092,000
Net Cash Provided by Operating Activities		95,103,000	84,991,000	87,131,000
Cash Flows from Investing Activities:
Net cash acquired in acquisitions		0	0	13,454,000
Proceeds from repayments and maturities of available for sale securities		181,706,000	700,409,000	147,130,000
Proceeds from repayments and maturities of held to maturity securities		66,709,000	38,941,000	31,457,000
Proceeds from sales of equity securities		0	4,148,000	1,287,000
Proceeds from sales of available for sale securities		4,402,000	130,912,000	0
Purchase of available for sale securities		(611,589,000)	(921,343,000)	(211,503,000)
Purchase of held to maturity securities		(310,128,000)	(6,377,000)	(21,453,000)
Purchase of equity securities		(2,959,000)	(2,772,000)	(1,343,000)
Proceeds from redemptions of Federal Home Loan Bank stock		13,817,000	106,808,000	95,643,000
Purchases of Federal Home Loan Bank stock		(10,887,000)	(96,282,000)	(103,080,000)
Death benefit proceeds from bank owned life insurance		470,000	0	121,000
Net decrease (increase) in loans		35,945,000	(876,021,000)	(252,441,000)
Proceeds from sales of loans previously held for investment		21,765,000	0	0
Proceeds from dispositions and sales of bank premises and equipment		278,000	50,000	1,827,000
Purchases of premises and equipment		(4,851,000)	(7,539,000)	(5,936,000)
Proceeds from sales of other real estate and other repossessed assets		32,000	1,044,000	860,000
Net Cash Used in Investing Activities:		(615,290,000)	(928,022,000)	(303,977,000)
Cash Flows from Financing Activities:
Net increase in deposits		510,077,000	1,162,206,000	264,279,000
(Decrease) increase in federal funds purchased and securities sold under agreements to repurchase		(63,107,000)	(159,098,000)	94,753,000
Proceeds from other borrowings		0	25,000,000	46,260,000
Repayments of other borrowings		0	(169,948,000)	(89,353,000)
Purchase of treasury stock		0	(1,452,000)	0
Proceeds from issuance of subordinated debt, net		147,738,000	0	0
Redemption of subordinated debentures, net		(88,330,000)	0	0
Exercise of stock options		19,000	0	313,000
Retirement of restricted stock		(651,000)	(501,000)	(715,000)
Dividends paid		(27,119,000)	(25,457,000)	(24,919,000)
Net Cash Provided by Financing Activities:		478,627,000	830,750,000	290,618,000
Net (decrease) increase in cash and cash equivalents		(41,560,000)	(12,281,000)	73,772,000
Cash and cash equivalents, beginning of year		270,090,000	282,371,000	208,599,000
Cash and Cash Equivalents, End of Year		228,530,000	270,090,000	282,371,000
Supplemental schedule of non-cash investing and financing activities:
Cash paid during the period for income taxes		29,111,000	22,486,000	15,944,000
Cash paid during the period for interest		23,372,000	42,600,000	59,949,000
Transfer of debt securities to held to maturity at fair value		494,164,000	0	0
Transfer of loans to loans held for sale		21,689,000	0	0
Transfer of loans into other real estate owned		0	393,000	665,000
Initial recognition of operating lease right-of-use assets		0	0	18,651,000
Initial recognition of operating lease liabilities		0	0	20,203,000
Right-of-use asset obtained in exchange for new operating lease liabilities		717,000	1,159,000	1,748,000
Non-cash assets acquired:
Federal Home Loan Bank stock		0	0	1,767,000
Investment securities		0	0	22,734,000
Loans, including loans held for sale		0	0	426,118,000
Goodwill and other intangible assets, net		0	0	23,125,000
Other assets		0	0	9,304,000
Total non-cash assets acquired		0	0	483,048,000
Liabilities assumed:
Deposits		0	0	409,638,000
Other borrowings		0	0	40,957,000
Other liabilities		0	0	2,490,000
Total liabilities assumed		0	0	453,085,000
Common stock issued for acquisitions		$ 0	$ 0	$ 43,417,000

[1] The Company adopted ASU 2016-13 as of December 31, 2020. Prior year periods have not been restated.