Income Taxes - Deferred Tax Assets and Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Deferred tax assets:
Loans, principally due to allowance for loan losses	$ 30,903	$ 38,688
Deferred Tax Assets, Unrealized Losses on Trading Securities	9,473	0
Employee benefits	6,813	7,041
Other real estate owned write-downs and carrying costs	4,731	6,850
Deferred gain on sale of subsidiary	484	750
Deferred revenue on contract	545	0
Other	299	385
Deferred tax assets	53,248	53,714
Deferred tax liabilities:
Fixed assets, principally differences in bases and depreciation	(4,227)	(4,711)
Deferred Tax Liabilities, Unrealized Gains on Available For Sale Securities	0	(11,360)
Investment in joint venture partnership, principally due to differences in depreciation of partnership assets	(700)	(782)
Prepaid amounts	(1,247)	(1,052)
Government agency stock dividends	(1,965)	(2,060)
Goodwill and core deposit intangibles	(28,167)	(25,815)
Mortgage servicing rights	(4,337)	(4,418)
Other	(451)	(919)
Deferred tax liabilities	41,094	51,117
Net deferred tax assets	12,154	2,597
Income Taxes Receivable, Current	2,968
Current income tax payable		$ 3,691