Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Assets:
Cash and due from banks	$ 67,622	$ 76,915
Cash at Federal Reserve and other banks	434,629	521,453
Cash and cash equivalents	502,251	598,368
Investment securities:
Available for sale	97,269	104,647
Held to maturity	344,523	240,504
Restricted equity securities	9,163	9,163
Loans held for sale	1,119	2,270
Loans	1,687,052	1,672,007
Allowance for loan losses	(38,322)	(38,245)
Total loans, net	1,648,730	1,633,762
Foreclosed assets, net	3,215	6,262
Premises and equipment, net	32,004	31,612
Cash value of life insurance	52,706	52,309
Accrued interest receivable	6,690	6,516
Goodwill	15,519	15,519
Other intangible assets, net	831	883
Mortgage servicing rights	6,107	6,165
Other assets	35,057	36,086
Total assets	2,755,184	2,744,066
Deposits:
Noninterest-bearing demand	728,492	789,458
Interest-bearing	1,682,628	1,621,025
Total deposits	2,411,120	2,410,483
Accrued interest payable	865	938
Reserve for unfunded commitments	2,230	2,415
Other liabilities	36,035	31,711
Other borrowings	6,719	6,335
Junior subordinated debt	41,238	41,238
Total liabilities	2,498,207	2,493,120
Commitments and contingencies (Note 18)
Shareholders' equity:
Common stock, no par value: 50,000,000 shares authorized; issued and outstanding: 16,120,297 at March 31, 2014 16,076,662 at December 31, 2013	91,773	89,356
Retained earnings	163,402	159,733
Accumulated other comprehensive income, net of tax	1,802	1,857
Total shareholders' equity	256,977	250,946
Total liabilities and shareholders' equity	$ 2,755,184	$ 2,744,066