CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	3 Months Ended	6 Months Ended	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities:
Net income	$ 8,023,000		$ 18,565,000	$ 19,925,000	$ 17,507,000
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Depreciation and amortization			2,045,000	886,000	914,000
Provision for loan losses			4,683,000	350,000	325,000
Net deferred income tax expense			184,000	1,739,000	1,912,000
Stock-based compensation expense			223,000	59,000	39,000
Net other-than-temporary impairment losses				652,000	870,000
Net gains on sales of available-for-sale securities			(2,818,000)	(2,363,000)	(2,882,000)
Net gains on sales of loans held for sale			(261,000)	(294,000)	(484,000)
Net loans originated for sale			(10,994,000)	(14,816,000)	(22,013,000)
Proceeds from sales of loans held for sale			11,445,000	16,601,000	22,024,000
Net gains on disposition of premises and equipment		66,000		(2,000)
Net loss on sales of other real estate owned			23,000	75,000	9,000
Life insurance death benefit				(291,000)
Increase in cash surrender value of bank owned life insurance			(1,303,000)	(1,073,000)	(1,018,000)
Net amortization of securities			2,074,000	3,316,000	4,589,000
Increase in accrued interest receivable			(428,000)	(233,000)	(241,000)
Decrease (increase) in other assets			2,200,000	414,000	(1,465,000)
Increase (decrease) in other liabilities			377,000	(1,792,000)	980,000
Net cash provided by operating activities			26,015,000	23,153,000	21,066,000
Investment securities available-for-sale:
Purchases			(37,886,000)	(155,464,000)	(207,880,000)
Sales			80,449,000	122,165,000	130,059,000
Maturities, calls and principal repayment			33,496,000	46,378,000	48,406,000
Investment securities held-to-maturity:
Purchases			(20,860,000)	(23,531,000)	(16,606,000)
Maturities and principal repayment			10,766,000	3,830,000	30,258,000
Net (purchase) redemption of restricted investment in bank stock			(903,000)	(22,000)	319,000
Net increase in loans			(279,270,000)	(71,761,000)	(83,478,000)
Purchases of premises and equipment			(2,037,000)	(973,000)	(842,000)
Purchase of bank-owned life insurance					(5,000,000)
Proceeds from life insurance death benefits				592,000
Proceeds from sale of premises and equipment				2,000
Proceeds from sale of other real estate owned			1,544,000	1,230,000	500,000
Cash and cash equivalent acquired in acquisition			70,318,000		6,195,000
Cash consideration paid in acquisition					(10,251,000)
Net cash used in investing activities			(144,383,000)	(77,554,000)	(108,320,000)
Cash flows from financing activities:
Net increase in deposits			82,260,000	35,083,000	100,271,000
Net increase in borrowings			161,183,000
Payments on borrowings			(75,000,000)		(15,000,000)
Cash dividends on common stock			(6,940,000)	(4,254,000)	(2,778,000)
Cash dividends on preferred stock			(140,000)	(141,000)	(363,000)
Issuance cost of common stock			(7,000)	(13,000)	(8,000)
Tax benefit from exercise of stock options			282,000	16,000	28,000
Issuance of restricted stock award				243,000
Proceeds from exercise of stock options			885,000	21,000	141,000
Net cash provided by financing activities			162,523,000	30,955,000	82,291,000
Net (decrease) increase in cash and cash equivalents			44,155,000	(23,446,000)	(4,963,000)
Cash and cash equivalents at beginning of year			82,692,000	106,138,000	111,101,000
Cash and cash equivalents at end of year	126,847,000	126,847,000	126,847,000	82,692,000	106,138,000
Cash paid during year for:
Interest paid on deposits and borrowings			14,785,000	10,993,000	11,894,000
Income taxes			4,993,000	4,727,000	6,280,000
Investing:
Trade date accounting settlement for investments				8,759,000
Transfer of loans to other real estate owned			352,000	236,000	1,300,000
Transfer from investment securities available-for-sale to investment securities held-to-maturity				138,800,000
Financing:
Dividends declared, not paid			2,250,000	1,256,000	899,000
Noncash assets acquired:
Investment securities	28,452,000	28,452,000	28,452,000		37,143,000
Restricted investments	13,646,000	13,646,000	13,646,000
Loans held for sale	190,000	190,000	190,000
Loans	1,299,284,000	1,299,284,000	1,299,284,000		52,192,000
Accrued interest receivable	4,470,000	4,470,000	4,470,000
Premises and equipment, net	6,475,000	6,475,000	6,475,000		1,262,000
Goodwill	129,105,000	129,105,000	129,105,000
Core deposit intangible	5,308,000	5,308,000	5,308,000
Bank-owned life insurance	15,481,000	15,481,000	15,481,000
Other real estate owned	2,455,000	2,455,000	2,455,000
Other assets	14,286,000	14,286,000	14,286,000		389,000
Total noncash assets acquired	1,519,152,000	1,519,152,000	1,519,152,000		90,986,000
Noncash liabilities assumed:
Deposits	1,051,342,000	1,051,342,000	1,051,342,000		85,236,000
Borrowings	263,370,000	263,370,000	263,370,000
Other liabilities	10,527,000	10,527,000	10,527,000		795,000
Total noncash liabilities assumed	1,325,239,000	1,325,239,000	1,325,239,000		86,031,000
Net noncash assets acquired	193,913,000	193,913,000	193,913,000		4,056,000
Bargain gain on acquisition					899,000
Net cash and cash equivalents acquired			70,318,000		6,195,000
Cash consideration paid in acquisition					$ 10,251,000