Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Cash flows from operating activities:
Net income	$ 17,029	$ 17,828
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization of intangibles	2,094	2,292
Provision for loan losses	400	1,500
Deferred tax expense	2,396	1,204
Increase in cash surrender value of Bank-owned life insurance	(1,302)	(1,210)
Net amortization of premiums and discounts on securities	2,276	3,838
Accretion of net deferred loan fees	(746)	(1,291)
Amortization of premiums on purchased loans, net	153	324
Net increase in loans originated for sale	(8,267)	(10,446)
Proceeds from sales of loans originated for sale	8,390	10,824
Proceeds from sales of foreclosed assets	1,374	2,639
ESOP expense	756	627
Allocation of stock award shares	1,306	916
Allocation of stock options	79	71
Net gain on sale of loans	(123)	(378)
Net loss (gain) on securities transactions	350	(511)
Net gain on sale of premises and equipment	(1)	0
Net (gain) loss on sale of foreclosed assets	(110)	214
Decrease in accrued interest receivable	1,216	1,903
Decrease (increase) in other assets	269	(5,026)
Decrease in other liabilities	(4,224)	(6,475)
Net cash provided by operating activities	23,315	18,843
Cash flows from investing activities:
Proceeds from maturities, calls and paydowns of investment securities held to maturity	19,388	31,731
Purchases of investment securities held to maturity	(19,926)	(15,789)
Proceeds from sales of securities	6,085	7,919
Proceeds from maturities, calls and paydowns of securities available for sale	44,462	106,313
Purchases of securities available for sale	(18,566)	(71,352)
BOLI benefits received	1,905	0
Purchases of loans	(8,546)	(2,797)
Net increase in loans	(56,304)	(4,568)
Purchases of premises and equipment	(5,776)	(1,165)
Net cash used in (provided by) investing activities	(37,278)	50,292
Cash flows from financing activities:
Net decrease in deposits	(11,051)	(151,690)
Increase in mortgage escrow deposits	1,852	1,303
Purchases of treasury stock	(3,881)	(839)
Cash dividends paid to stockholders	(9,190)	(8,086)
Shares issued dividend reinvestment plan	334	301
Stock options exercised	0	18
Proceeds from long-term borrowings	181,991	20,000
Payments on long-term borrowings	(25,000)	(20,406)
Net (decrease ) increase in short-term borrowings	(140,658)	51,148
Net used in financing activities	(5,603)	(108,251)
Net decrease in cash and cash equivalents	(19,566)	(39,116)
Cash and cash equivalents at beginning of period	101,224	103,823
Cash and cash equivalents at end of period	81,658	64,707
Cash paid during the period for:
Interest on deposits and borrowings	9,176	9,508
Income taxes	1,502	5,002
Non cash investing activities:
Transfer of loans receivable to foreclosed assets	$ 2,481	$ 2,676