Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Cash flows from operating activities:
Net income	$ 34,562	$ 33,259
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	2,977	3,307
Deferred taxes	1,711	1,421
Stock-based compensation	518	548
Excess tax benefits of stock-based compensation	190	22
Provision for loan losses	6,740	5,380
Write-downs of other real estate owned and other repossessed assets	1,146	1,402
Gains on sale of mortgage loans held for sale	(1,575)	(781)
Securities (gains) losses	(142)	145
Losses on sale of assets, net	(115)	(3)
Proceeds from sale of mortgage loans held for sale	63,580	33,240
Funding of mortgage loans held for sale	(61,724)	(31,998)
Amortization of securities premiums and discounts, net	2,552	2,011
Change in cash surrender value of bank owned life insurance	(1,245)	(1,113)
Mortgage servicing rights:
Fair value adjustments	381	546
New servicing assets created	(443)	(234)
Changes in:
Other assets	(9,612)	297
Other liabilities	(1,068)	(943)
Net cash provided by operating activities	38,433	46,506
Certificates of deposit in other banks:
Maturity of certificates of deposit	2,438	389
Securities available-for-sale (AFS):
Purchase of AFS securities	(36,561)	(177,579)
Proceeds from the sales of AFS securities	44,198	112,949
Proceeds from prepayments and maturities of AFS securities	56,809	49,094
Securities held-to-maturity (HTM):
Proceeds from maturities of HTM securities	1	0
Change in loans, net	(98,730)	(73,376)
Purchase of premises and equipment	(1,685)	(1,750)
Proceeds from sale of premises and equipment	232	22
Redemption of stock by Federal Home Loan Bank	0	7,746
Additional investment in Federal Reserve Bank stock	(18)	(1)
Proceeds from sale of other real estate and other repossessed assets	7,563	4,551
Additional investment in other real estate and other repossessed assets	(85)	0
Net cash used in investing activities	(25,838)	(77,955)
Cash flows from financing activities:
Change in deposits, net	100,972	47,107
Change in repurchase agreements, federal funds purchased, and other short-term borrowings, net	19,141	10,677
Advances from Federal Home Loan Bank	70,000	0
Payments on advances from Federal Home Loan Bank	(130,086)	(87)
Issuance of common stock	1,345	930
Repurchase of common stock	(189)	0
Excess tax benefits of stock-based compensation	(190)	(22)
Dividends paid	(15,913)	(15,339)
Net cash provided by financing activities	45,080	43,266
Net increase in cash and cash equivalents	57,675	11,817
Cash and cash equivalents at beginning of period	105,517	106,641
Cash and cash equivalents at end of period	163,192	118,458
Supplemental disclosures:
Income taxes paid	15,199	10,170
Interest paid	7,935	8,058
Non-cash activities:
Loans to facilitate the sale of other real estate and repossessed assets	3,548	5,745
Common stock dividends accrued, paid in subsequent quarter	220	207
Real estate acquired in settlement of loans	$ 9,694	$ 5,267