Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Cash flows from operating activities:
Net income	$ 35,480	$ 34,562
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	2,878	2,977
Deferred taxes	519	1,711
Stock-based compensation	347	518
Excess tax benefits of stock-based compensation	(58)	190
Provision for loan losses	5,829	6,740
Write-downs of other real estate owned and other repossessed assets	632	1,146
Gains on sale of mortgage loans held for sale	(1,357)	(1,575)
Securities gains	(522)	(142)
(Gains)/losses on sale of assets, net	77	(115)
Proceeds from sale of mortgage loans held for sale	61,339	63,580
Funding of mortgage loans held for sale	(60,885)	(61,724)
Amortization of securities premiums and discounts, net	1,614	2,552
Change in cash surrender value of bank owned life insurance	(1,151)	(1,245)
Mortgage servicing rights:
Fair value adjustments	660	381
New servicing assets created	(388)	(443)
Changes in:
Other assets	(3,902)	(9,612)
Other liabilities	11,967	(1,068)
Net cash provided by operating activities	53,079	38,433
Certificates of deposit in other banks:
Maturity of certificates of deposit	2,852	2,438
Securities available-for-sale (AFS):
Purchase of AFS securities	(159,603)	(36,561)
Proceeds from the sales of AFS securities	54,446	44,198
Proceeds from prepayments and maturities of AFS securities	73,027	56,809
Securities held-to-maturity (HTM):
Proceeds from maturities of HTM securities	480	1
Change in loans, net	(65,136)	(98,730)
Purchase of premises and equipment	(2,411)	(1,685)
Proceeds from sale and retirement of premises and equipment	10	232
Investment in Federal Reserve Bank stock	0	(18)
Proceeds from sale of other real estate and other repossessed assets	4,041	7,563
Investment in other real estate and other repossessed assets	0	(85)
Net cash used in investing activities	(92,294)	(25,838)
Cash flows from financing activities:
Change in deposits, net	73,203	100,972
Change in repurchase agreements, federal funds purchased, and other short-term borrowings, net	14,272	19,141
Advances from Federal Home Loan Bank	0	70,000
Payments on advances from Federal Home Loan Bank	(100,085)	(130,086)
Issuance of common stock	2,262	1,345
Repurchase of common stock	(382)	(189)
Excess tax benefits of stock-based compensation	58	(190)
Dividends paid	(16,546)	(15,913)
Net cash provided by (used in) financing activities	(27,218)	45,080
Net increase (decrease) in cash and cash equivalents	(66,433)	57,675
Cash and cash equivalents at beginning of period	187,611	105,517
Cash and cash equivalents at end of period	121,178	163,192
Supplemental disclosures:
Income taxes paid	13,991	15,199
Interest paid	8,796	7,935
Non-cash activities:
Loans to facilitate the sale of other real estate owned and repossessed assets	2,624	3,548
Common stock dividends accrued, paid in subsequent quarter	212	220
Real estate acquired in settlement of loans	$ 4,300	$ 9,986