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CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Operating activities:    
Net income $ 22,173 $ 20,241
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation 3,286 3,007
Amortization of intangible assets 1,141 1,179
Net accretion of premiums and discounts on securities and borrowings (1,868) (1,477)
Stock-based compensation 1,182 1,220
Provision for loan losses 1,000 1,393
Amortization of mortgage servicing rights 117 142
Income from bank-owned life insurance policies (289) (283)
Gain on sales of investment securities 0 (47,791)
Loss on debt extinguishments 0 47,783
Net (gain)/loss from sale of loans and other assets (128) 71
Net change in loans held for sale (7) 2
Change in other assets and liabilities 105 (3,964)
Net cash provided by operating activities 26,712 21,523
Investing activities:    
Proceeds from sales of available-for-sale investment securities 0 398,654
Proceeds from maturities of available-for-sale investment securities 19,231 52,802
Proceeds from maturities of held-to-maturity investment securities 0 8,315
Proceeds from maturities of other investment securities 11 0
Proceeds from sale of other investment securities 0 16,737
Purchases of available-for-sale investment securities (260,923) (121,665)
Purchases of held-to-maturity investment securities 0 (1,825)
Purchases of other securities (3,384) 0
Net decrease in loans 11,603 2,607
Cash paid for acquisition, net of cash acquired of $0 and $0, respectively (924) 0
Purchases of premises and equipment, net (1,395) (2,502)
Net cash (used in)/provided by investing activities (235,781) 353,123
Financing activities:    
Net increase in deposits 142,844 146,785
Net change in borrowings, net of payments of $3 and $414,422 75,197 (414,422)
Issuance of common stock 4,844 4,912
Cash dividends paid (11,291) (10,699)
Tax benefits from share-based payment arrangements 1,245 518
Net cash provided by/(used in) financing activities 212,839 (272,906)
Change in cash and cash equivalents 3,770 101,740
Cash and cash equivalents at beginning of period 149,647 228,558
Cash and cash equivalents at end of period 153,417 330,298
Supplemental disclosures of cash flow information:    
Cash paid for interest 3,182 11,719
Cash paid for income taxes 164 4,168
Supplemental disclosures of noncash financing and investing activities:    
Dividends declared and unpaid 11,355 10,735
Transfers from loans to other real estate $ 763 $ 2,396