Consolidated Statements of Cash Flows (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities
Net income	$ 17,331,000	$ 17,033,000	$ 12,535,000
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization	7,613,000	2,208,000	2,238,000
Accretion of acquired loans	(3,194,000)	0	0
Provision for loan losses	(3,000,000)	(7,200,000)	(3,100,000)
Deferred income tax expense	4,506,000	8,092,000	5,636,000
Stock-based compensation expense	714,000	473,000	54,000
Stock grants to directors for retainer fee	155,000	0	0
Proceeds from sales of mortgage loans held for sale	67,422,000	51,373,000	83,713,000
Origination of mortgage loans held for sale	(65,392,000)	(48,321,000)	(83,986,000)
Net gain on sales of mortgage loans held for sale	(1,625,000)	(658,000)	(1,247,000)
Net (gain) loss on sale and valuation write-downs of foreclosed assets	(894,000)	(1,585,000)	1,725,000
Earnings on bank owned life insurance	(1,184,000)	(1,329,000)	(1,528,000)
Net change in:
Accrued interest receivable	(11,000)	225,000	529,000
Other assets	1,795,000	8,465,000	(1,805,000)
Accrued interest and other liabilities	(9,822,000)	(94,000)	2,267,000
Net cash from operating activities	14,414,000	28,682,000	17,031,000
Cash flows from investing activities
Cash received in merger	91,806,000	0	0
Securities available for sale	(19,874,000)	(49,812,000)	(69,956,000)
Proceeds from:
Maturities, calls and repayments of securities available for sale	75,880,000	34,809,000	102,672,000
Proceeds from sales of securities available for sale	0	10,310,000	0
Proceeds from Federal Home Loan Bank stock redemption	5,527,000	0	0
Loan originations and payments, net	(90,853,000)	(15,298,000)	16,237,000
Purchases of premises and equipment, net	(2,150,000)	(326,000)	(571,000)
Proceeds from sale of foreclosed assets	4,427,000	7,898,000	18,348,000
Net cash from (for) investing activities	64,763,000	(12,419,000)	66,730,000
Cash flows from financing activities
Net decrease in time deposits	(58,927,000)	(23,038,000)	(47,257,000)
Net increase (decrease) in all other deposits	(11,307,000)	6,745,000	70,386,000
Net increase (decrease) in securities sold under agreements to repurchase	43,780,000	4,540,000	(7,804,000)
Proceeds from Federal Home Loan Bank advances	0	10,000,000	20,000,000
Maturities and prepayments of Federal Home Loan Bank advances	(3,000,000)	0	(30,000,000)
Repurchase of preferred stock	0	0	(21,000,000)
Repurchase of common stock warrant	0	0	(7,465,000)
Proceeds from stock option exercises, net of cashless exercises	282,000	289,000	227,000
Employee stock purchase plan	23,000	19,000	39,000
Dividend reinvestment plan	209,000	33,000	14,000
Payment of cash dividends on preferred stock	0	0	(496,000)
Payment of cash dividends to common shareholders	(24,464,000)	(3,889,000)	(774,000)
Net cash for financing activities	(53,404,000)	(5,301,000)	(24,130,000)
Net change in cash and cash equivalents	25,773,000	10,962,000	59,631,000
Cash and cash equivalents at beginning of period	146,965,000	136,003,000	76,372,000
Cash and cash equivalents at end of period	172,738,000	146,965,000	136,003,000
Cash paid during the year for:
Interest	11,439,000	11,059,000	13,741,000
Federal income taxes	2,625,000	0	0
Noncash financing and investing activities:
Transfers from loans to foreclosed assets	1,490,000	2,194,000	11,761,000
Common stock issued in connection with the Firstbank merger	$ 173,310,000	$ 0	$ 0