Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Operating activities:
Net income	$ 20,458	$ 22,163
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of premises and equipment, and amortization	4,035	3,229
Amortization of intangible assets	157	157
Benefit from reversal of provision for loan losses	(2,624)	(887)
Amortization of investment securities premium, net	578	597
Originations of loans for resale	(49,241)	(123,834)
Proceeds from sale of loans originated for resale	49,834	136,421
Gain on sale of loans	(1,487)	(4,967)
Change in market value of mortgage servicing rights	620	(311)
Provision for losses on foreclosed assets	137	620
Gain on sale of foreclosed assets	(1,853)	(1,479)
(Gain) loss on disposal of fixed assets	(60)	12
Increase in cash value of life insurance	(1,287)	(1,337)
Equity compensation vesting expense	810	849
Equity compensation tax benefits	(225)	(356)
Change in:
Reserve for unfunded commitments	(195)	(740)
Interest receivable	(346)	186
Interest payable	(185)	(99)
Other assets and liabilities, net	2,625	3,408
Net cash from operating activities	21,751	33,632
Investing activities:
Proceeds from maturities of securities available for sale	19,226	43,768
Proceeds from maturities of securities held to maturity	18,727	1,629
Purchases of securities held to maturity	(221,984)	(194,942)
(Purchase) redemption of restricted equity securities	(2,419)	484
Loan origination and principal collections, net	(64,023)	(39,986)
Loans purchased	(32,017)	(62,698)
Improvement of foreclosed assets	(461)
Proceeds from sale of other real estate owned	7,818	12,252
Proceeds from sale of premises and equipment	120	9
Purchases of premises and equipment	(3,857)	(6,771)
Life insurance proceeds		706
Net cash used by investing activities	(278,870)	(245,549)
Financing activities:
Net increase in deposits	26,873	3,609
Net change in other borrowings	6,330	5,429
Equity compensation tax benefits	225	356
Repurchase of common stock	(292)	(501)
Dividends paid	(5,322)	(4,976)
Exercise of stock options	616	251
Net cash provided by financing activities	28,430	4,168
Net change in cash and cash equivalents	(228,689)	(207,749)
Cash and cash equivalents and beginning of year	598,368	748,899
Cash and cash equivalents at end of period	369,679	541,150
Supplemental disclosure of noncash activities:
Unrealized (loss) gain on securities available for sale	(133)	8,035
Loans transferred to foreclosed assets	4,475	3,498
Market value of shares tendered in-lieu of cash to pay for exercise of options and/or related taxes	2,259	3,490
Supplemental disclosure of cash flow activity:
Cash paid for interest expense	3,429	3,672
Cash paid for income taxes	$ 14,405	$ 15,110