Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Assets:
Cash and due from banks	$ 70,023	$ 81,086
Cash at Federal Reserve and other banks	732,248	667,813
Cash and cash equivalents	802,271	748,899
Securities available-for-sale	144,454	163,027
Restricted equity securities	9,647	9,647
Loans held for sale	7,931	12,053
Loans	1,532,362	1,564,823
Allowance for loan losses	(39,867)	(42,648)
Total loans, net	1,492,495	1,522,175
Foreclosed assets, net	6,124	7,498
Premises and equipment, net	29,468	26,985
Cash value of life insurance	51,008	50,582
Accrued interest receivable	7,201	6,636
Goodwill	15,519	15,519
Other intangible assets, net	1,040	1,092
Mortgage servicing rights	4,984	4,552
Indemnification asset	1,807	1,997
Other assets	38,484	38,607
Total assets	2,612,433	2,609,269
Deposits:
Noninterest-bearing demand	639,420	684,833
Interest-bearing	1,646,130	1,604,869
Total deposits	2,285,550	2,289,702
Accrued interest payable	975	1,036
Reserve for unfunded commitments	3,175	3,615
Other liabilities	37,340	35,122
Other borrowings	8,125	9,197
Junior subordinated debt	41,238	41,238
Total liabilities	2,376,403	2,379,910
Commitments and contingencies (Note 18)
Shareholders' equity:
Common stock, no par value: 50,000,000 shares authorized; issued and outstanding:16,005,191 at March 31, 2013, 16,000,838 at December 31, 2012	85,995	85,561
Retained earnings	148,497	141,639
Accumulated other comprehensive income, net of tax	1,538	2,159
Total shareholders' equity	236,030	229,359
Total liabilities and shareholders' equity	$ 2,612,433	$ 2,609,269