Consolidated Statements of Cash Flows - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash flows from operating activities:
Net income	$ 8,464,000	$ 8,258,000
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Provision for loan losses	41,000	1,795,000
Depreciation and amortization	2,983,000	3,341,000
Current income tax receivable	(4,233,000)	444,000
Deferred income taxes	(609,000)	(1,734,000)
Net excess tax (benefit) deficit on stock-based compensation	(371,000)	(2,845,000)
Accretion Expense	6,508,000	6,191,000
Discount accretion, net of premium amortization	821,000	703,000
Gain on sale of mortgage loans, net	(6,803,000)	(454,000)
Origination of loans held for sale, net of repayments	(219,584,000)	(14,925,000)
Proceeds from sales of loans held for sale	235,104,000	32,194,000
Bank-owned life insurance income	(452,000)	(470,000)
Gain on the sale of other real estate owned, net	78,000	(112,000)
Impairment on other real estate owned	38,000	46,000
Loss (gain) on sale of fixed assets		(3,000)
Stock-based compensation	833,000	902,000
(Increase) decrease in other assets	(5,630,000)	(3,280,000)
(Decrease) increase in other liabilities	6,337,000	3,576,000
Net cash provided by (used in) operating activities	10,509,000	21,245,000
Cash flows from investing activities:
Purchase of FHLB stock	(2,950,000)
Proceeds from redemption of FHLB stock	8,690,000	1,884,000
Proceeds from maturities of investment securities held-to-maturity	15,526,000	18,350,000
Proceeds from maturities of investment securities available-for-sale	55,152,000	59,155,000
Proceeds from sales of investment securities available-for-sale	33,202,000
Purchase of investment securities available-for-sale	(42,199,000)	(96,948,000)
Purchase of investment securities held-to-maturity	(40,735,000)
Net increase in loans	9,136,000	(87,543,000)
Sales (purchases) of premises and equipment, net	(1,905,000)	(783,000)
Proceeds from sales of loans		20,269,000
Proceeds from sales of other real estate owned	36,000	755,000
Net cash activity from acquisitions	68,983,000
Net cash provided by (used in) investing activities	102,936,000	(84,861,000)
Cash flows from financing activities:
Net increase (decrease) in deposits	(160,000)	99,294,000
Increase (decrease) in repurchase agreements	10,724,000	(314,000)
Advances from FHLB		92,798,000
FHLB payoffs	(85,605,000)	(54,683,000)
Issuance of stock under purchase and equity compensation plans	(517,000)	(5,737,000)
Proceeds from exercise of stock options	4,360,000
Payment of dividends	(2,741,000)	(2,048,000)
Net cash proivded by (used in) financing activities	(73,939,000)	129,310,000
Increase (decrease) in cash, cash equivalents and restricted cash	39,506,000	65,694,000
Cash, cash equivalents and restricted cash at beginning of the year	257,364,000	152,736,000
Cash, cash equivalents and restricted cash at end of period	296,870,000	218,430,000
Supplemental disclosure of cash flow information during the period:
Cash paid for interest	3,723,000	2,745,000
Net tax (refunds) payments	164,000	(7,000)
Supplemental schedule of non-cash investing activities:
Loans transferred to other real estate owned at fair value	127,000	578,000
Loans purchased but not settled	(15,068,000)	16,141,000
Transfer of Loans Held-for-sale to Portfolio Loans	878,000	$ 3,825,000
Treasury stock reissued for acquisition of Peoples	$ 110,213,000