Consolidated Statements of Cash Flows (USD $)	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Cash flows from operating activities:
Net income	$ 33,380,000	$ 37,056,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization of intangibles	4,562,000	4,598,000
Provision for loan losses	1,900,000	2,500,000
Deferred tax expense	1,820,000	1,761,000
Increase in cash surrender value of Bank-owned life insurance	(2,879,000)	(4,154,000)
Net amortization of premiums and discounts on securities	4,792,000	7,277,000
Accretion of net deferred loan fees	(1,541,000)	(2,064,000)
Amortization of premiums on purchased loans, net	353,000	756,000
Net increase in loans originated for sale	(3,524,000)	(14,344,000)
Proceeds from sales of loans originated for sale	3,807,000	15,161,000
Proceeds from sales of foreclosed assets	3,539,000	3,704,000
ESOP expense	1,483,000	1,258,000
Allocation of stock award shares	3,654,000	2,802,000
Allocation of stock options	152,000	141,000
Net gain on sale of loans	(283,000)	(817,000)
Net loss (gain) on securities transactions	240,000	(934,000)
Net (gain) loss on sale of premises and equipment	(1,000)	29,000
Net (gain) loss on sale of foreclosed assets	(385,000)	195,000
Decrease in accrued interest receivable	405,000	1,003,000
Increase in other assets	(14,780,000)	(5,338,000)
Increase (decrease) in other liabilities	961,000	(3,303,000)
Net cash provided by operating activities	37,655,000	47,287,000
Cash flows from investing activities:
Proceeds from maturities, calls and paydowns of investment securities held to maturity	24,481,000	51,146,000
Purchases of investment securities held to maturity	(40,577,000)	(44,718,000)
Proceeds from sales of securities	15,007,000	14,834,000
Proceeds from maturities, calls and paydowns of securities available for sale	91,710,000	196,434,000
Purchases of securities available for sale	(18,566,000)	(151,861,000)
Cash received, net of cash consideration paid for acquisition	68,650,000	0
Purchases of loans	(31,027,000)	(4,558,000)
Net increase in loans	(54,216,000)	(93,406,000)
Proceeds from sales of premises and equipment	0	35,000
Purchases of premises and equipment	(10,890,000)	(5,188,000)
Net cash provided by (used) in in investing activities	44,572,000	(37,282,000)
Cash flows from financing activities:
Net decrease in deposits	(134,377,000)	(179,359,000)
Increase in mortgage escrow deposits	2,586,000	1,839,000
Purchases of treasury stock	(3,880,000)	(5,883,000)
Cash dividends paid to stockholders	(18,234,000)	(16,527,000)
Shares issued dividend reinvestment plan	659,000	595,000
Stock options exercised	106,000	153,000
Proceeds from long-term borrowings	322,231,000	50,000,000
Payments on long-term borrowings	(161,959,000)	(45,798,000)
Net (decrease) increase in short-term borrowings	(58,144,000)	161,657,000
Net cash used in financing activities	(51,012,000)	(33,323,000)
Net increase (decrease) in cash and cash equivalents	31,215,000	(23,318,000)
Cash and cash equivalents at beginning of period	101,224,000	103,823,000
Cash and cash equivalents at end of period	132,439,000	80,505,000
Cash paid during the period for:
Interest on deposits and borrowings	19,283,000	18,692,000
Income taxes	12,531,000	13,344,000
Non-cash investing activities:
Transfer of loans receivable to foreclosed assets	4,206,000	5,537,000
Non-cash assets acquired:
Investment securities available for sale	157,635	0
Loans	631,390	0
Bank-owned life insurance	22,319
Goodwill and other intangible assets, net	50,041	0
Other assets	33,939	0
Total non-cash assets acquired	895,324	0
Liabilities assumed:
Deposits	769,936	0
Borrowings	112,835	0
Other Liabilities	(2,314)	0
Total liabilities assumed	880,457	0
Common stock issued for acquisitions	$ 83,517	$ 0