Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Cash flows from operating activities
Net income	$ 23,539,000	$ 20,327,000
Adjustments to reconcile net income to net cash from operating activities
Depreciation and amortization	4,723,000	4,928,000
Accretion of acquired loans	(314,000)	(868,000)
Provision for loan losses	1,750,000	700,000
Stock-based compensation expense	1,488,000	1,136,000
Stock grants to directors for retainer fee	374,000	403,000
Proceeds from sales of mortgage loans held for sale	67,859,000	44,586,000
Origination of mortgage loans held for sale	(69,107,000)	(43,509,000)
Net gain from sales of mortgage loans held for sale	(2,129,000)	(1,587,000)
Net gain from sales and valuation write-downs of foreclosed assets	(31,000)	(126,000)
Net gain from sales and valuation write-downs of former bank premises	(558,000)	(78,000)
Net loss from sales and write-downs of fixed assets	1,000	55,000
Earnings on bank owned life insurance	(3,238,000)	(652,000)
Net change in:
Accrued interest receivable	(534,000)	(490,000)
Other assets	(1,278,000)	(2,629,000)
Accrued interest payable and other liabilities	(8,628,000)	(843,000)
Net cash from operating activities	13,917,000	21,353,000
Cash flows from investing activities
Loan originations and payments, net	(124,964,000)	(76,457,000)
Purchases of securities available for sale	(24,182,000)	(31,122,000)
Proceeds from maturities, calls and repayments of securities available for sale	27,258,000	26,069,000
Proceeds from sales of foreclosed assets	270,000	451,000
Proceeds from sales of former bank premises	854,000	1,964,000
Purchases of Federal Home Loan Bank stock	(1,980,000)	0
Purchases of bank owned life insurance	(2,500,000)	0
Proceeds from bank owned life insurance cash value release and death benefits	7,708,000	0
Net purchases of premises and equipment	(5,359,000)	(3,097,000)
Net cash for investing activities	(122,895,000)	(82,192,000)
Cash flows from financing activities
Net increase (decrease) in time deposits	175,869,000	(42,376,000)
Net increase (decrease) in all other deposits	(20,368,000)	49,822,000
Net increase (decrease) in securities sold under agreements to repurchase	16,150,000	(24,175,000)
Maturities of Federal Home Loan Bank advances	(20,000,000)	(30,000,000)
Proceeds from Federal Home Loan Bank advances	44,000,000	40,000,000
Proceeds from stock option exercises	16,000	55,000
Employee stock purchase plan	26,000	26,000
Dividend reinvestment plan	361,000	328,000
Repurchases of common stock shares	(3,601,000)	0
Payment of cash dividends to common shareholders	(8,404,000)	(7,202,000)
Net cash from (for) financing activities	184,049,000	(13,522,000)
Net change in cash and cash equivalents	75,071,000	(74,361,000)
Cash and cash equivalents at beginning of period	75,354,000	200,101,000
Cash and cash equivalents at end of period	150,425,000	125,740,000
Supplemental disclosures of cash flows information
Interest	14,956,000	9,942,000
Federal income tax	6,275,000	5,450,000
Transfers from loans to foreclosed assets	170,000	497,000
Transfers from bank premises to other real estate owned	$ 0	$ 296,000