Condensed Consolidated Statements of Cash Flows (unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Cash flows from operating activities:
Net income	$ 11,820	$ 11,869
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	1,151	1,061
Deferred taxes	905	771
Stock-based compensation	164	146
Excess tax benefits of stock-based compensation	35	336
Provision for loan losses	1,559	1,160
Write-downs of other real estate owned and other repossessed assets	1,146	179
Gains on sale of mortgage loans held for sale	(1,397)	(617)
(Gains)/losses on sale of assets, net	65	(35)
Proceeds from sale of mortgage loans held for sale	59,723	26,731
Funding of mortgage loans held for sale	(37,289)	(27,220)
Amortization of securities premiums and discounts, net	1,086	1,287
Change in cash surrender value of bank owned life insurance	(324)	(344)
Mortgage servicing rights:
Fair value adjustments	69	(207)
New servicing assets created	(357)	(151)
Changes in:
Other assets	(486)	(392)
Other liabilities	(5,968)	10,090
Net cash provided by operating activities	31,902	24,664
Certificates of deposit in other banks:
Purchase of certificates of deposit	(3,984)	(1,117)
Securities available-for-sale (AFS):
Purchase of AFS securities	(109,477)	(123,695)
Proceeds from prepayments and maturities of AFS securities	31,637	33,626
Change in loans, net	(15,881)	8,803
Purchase of premises and equipment	(267)	(1,436)
Proceeds from sale of premises and equipment	0	73
Additional investment in Federal Reserve Bank stock	(1)	(1)
Proceeds from sale of other real estate and other repossessed assets	2,347	2,089
Additional investment in other real estate and other repossessed assets	(5)	(90)
Additional investment in bank owned life insurance	(7,949)	0
Net cash used in investing activities	(103,580)	(81,748)
Cash flows from financing activities:
Change in deposits, net	29,732	69,194
Change in repurchase agreements, federal funds purchased, and other short-term borrowings, net	6,411	15,773
Payments on advances from Federal Home Loan Bank	(42)	(20,047)
Issuance of common stock	883	1,993
Excess tax benefits of stock-based compensation	(35)	(336)
Dividends paid	(4,887)	(4,753)
Net cash provided by financing activities	32,062	61,824
Net increase (decrease) in cash and cash equivalents	(39,616)	4,740
Cash and cash equivalents at beginning of period	207,560	238,481
Cash and cash equivalents at end of period	167,944	243,221
Supplemental disclosures:
Income taxes paid	4,500	3,800
Interest paid	3,411	5,290
Non-cash activities:
Loans to facilitate the sale of other real estate owned and other repossessed assets	318	952
Common stock dividends accrued, paid in subsequent quarter	4,900	4,783
Real estate acquired in settlement of loans	$ 2,047	$ 5,370