Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash flows from operating activities:
Net income	$ 36,581	$ 35,480
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	3,019	2,878
Deferred taxes	122	519
Stock-based compensation	447	347
Excess tax benefits of stock-based compensation	0	(58)
Provision for loan losses	4,659	5,829
Write-downs of other real estate owned and other repossessed assets	2,871	632
Gains on sale of mortgage loans held for sale	(897)	(1,357)
Securities gains	(58)	(522)
Gain on debt repurchase	(560)	0
(Gains)/losses on sale of assets, net	(2)	77
Proceeds from sale of mortgage loans held for sale	40,130	61,339
Funding of mortgage loans held for sale	(39,594)	(60,885)
Amortization of securities premiums and discounts, net	2,375	1,614
Change in cash surrender value of bank owned life insurance	(1,117)	(1,151)
Mortgage servicing rights:
Fair value adjustments	419	660
New servicing assets created	(269)	(388)
Changes in:
Other assets	(3,412)	(3,902)
Other liabilities	1,181	11,967
Net cash provided by operating activities	45,895	53,079
Certificates of deposit in other banks:
Purchase of certificates of deposit	(11,515)	0
Maturity of certificates of deposit	1,225	2,852
Securities available-for-sale (AFS):
Purchase of AFS securities	(146,822)	(159,603)
Proceeds from the sales of AFS securities	66,359	54,446
Proceeds from prepayments and maturities of AFS securities	82,672	73,027
Securities held-to-maturity (HTM):
Proceeds from maturities of HTM securities	8	480
Change in loans, net	(181,282)	(65,136)
Purchase of premises and equipment	(1,681)	(2,411)
Proceeds from sale and retirement of premises and equipment	25	10
Proceeds from sale of other real estate and other repossessed assets	3,073	4,041
Net cash used in investing activities	(187,938)	(92,294)
Cash flows from financing activities:
Change in deposits, net	119,058	73,203
Change in repurchase agreements and federal funds purchased, net	12,322	14,272
Proceeds from Federal Home Loan Bank advances	150,000	0
Payments on advances from Federal Home Loan Bank	(100,075)	(100,085)
Repurchase of long-term debt	(1,440)	0
Issuance of common stock	1,017	2,262
Repurchase of common stock	0	(382)
Excess tax benefits of stock-based compensation	0	58
Dividends paid	(17,139)	(16,546)
Net cash provided by (used in) financing activities	163,743	(27,218)
Net increase (decrease) in cash and cash equivalents	21,700	(66,433)
Cash and cash equivalents at beginning of period	144,716	187,611
Cash and cash equivalents at end of period	166,416	121,178
Supplemental disclosures:
Income taxes paid	16,250	13,991
Interest paid	11,151	8,796
Non-cash activities:
Loans to facilitate the sale of other real estate owned and repossessed assets	2,250	2,624
Common stock dividends accrued, paid in subsequent quarter	208	212
Real estate acquired in settlement of loans	$ 4,156	$ 4,300