CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Operating Activities
Net Income	$ 14,057,000	$ 11,339,000	$ 39,094,000	$ 31,649,000
Adjustments to reconcile net income to net cash provided by operating activities:
Originations of mortgage loans held for sale			(157,736,000)	(148,661,000)
Proceeds from the sale of mortgage loans			159,740,000	155,086,000
Gain on sale of mortgage loans, net of origination costs			(4,126,000)	(4,323,000)
Depreciation and amortization expense			2,845,000	2,789,000
Investment securities amortization and accretion, net			2,428,000	2,350,000
Purchase accounting accretion, net			(1,484,000)	(2,204,000)
Stock-based compensation expense			1,405,000	1,135,000
Provision for credit losses	354,000	817,000	840,000	2,797,000	$ 3,035,000
Amortization of intangible assets	182,000	473,000	544,000	1,417,000
Net (gain) loss on sale of premises and equipment			(34,000)	11,000
Net gain on sale of investment securities			(695,000)	(827,000)
Net increase in other real estate owned valuation allowance and gain on disposition			0	60,000
Increase in other assets			(5,444,000)	(93,000)
Increase in other liabilities			16,170,000	1,325,000
Net cash provided by operating activities			53,547,000	42,391,000
Investing Activities
Proceeds from the sale and maturity of available-for-sale securities			135,282,000	124,548,000
Purchase of available-for-sale securities			(148,842,000)	(127,684,000)
Proceeds from maturities of held-to-maturity securities			750,000	0
Net increase in loans			(126,860,000)	(153,629,000)
Purchase of bank-owned life insurance, net of death benefit proceeds			0	(7,000,000)
Purchase of Federal Home Loan Bank stock			(9,391,000)	(8,304,000)
Proceeds from sale of Federal Home Loan Bank stock			16,943,000	6,947,000
Purchase of premises and equipment			2,879,000	2,378,000
Proceeds from the sale of premises and equipment			749,000	137,000
Proceeds from the liquidation of equity investment			205,000	0
Recoveries of previously charged-off loans			361,000	442,000
Proceeds from the sale of other real estate owned			0	641,000
Net cash used by investing activities			(133,682,000)	(166,280,000)
Financing Activities
Net increase in deposits			220,376,000	128,131,000
Net (repayments of) proceeds from borrowings less than 90 days			(132,098,000)	33,841,000
Repayments of Federal Home Loan Bank Borrowings			0	(20,000,000)
Repayments of wholesale repurchase agreements			0	(5,000,000)
Exercise of stock options and issuance of restricted stock, net of repurchase for tax withholdings			(290,000)	(615,000)
Cash dividends paid on common stock			12,482,000	10,740,000
Net cash provided by financing activities			75,506,000	125,617,000
Net (decrease) increase in cash, cash equivalents and restricted cash			(4,629,000)	1,728,000
Cash, cash equivalents, and restricted cash at beginning of period			102,971,000	87,707,000	87,707,000
Cash, cash equivalents and restricted cash at end of period	$ 98,342,000	$ 89,435,000	98,342,000	89,435,000	$ 102,971,000
Supplemental information
Interest paid			21,434,000	15,383,000
Payments to Acquire Available-for-sale Securities, Debt			0	13,954,000
Income taxes paid			8,926,000	11,559,000
Real Estate Owned, Transfer to Real Estate Owned			$ 55,000	$ 0