Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Statement Of Cash Flows [Abstract]
NET CASH PROVIDED BY OPERATING ACTIVITIES	$ 41,380	$ 66,015
INVESTING ACTIVITIES
Net increase in loans	(55,683)	(115,220)
Securities available-for-sale:
Proceeds from sales	3,491	9,265
Proceeds from maturities, prepayments and calls	117,595	147,472
Purchases of securities	(182,501)	(126,546)
Securities held-to-maturity:
Proceeds from maturities, prepayments and calls	18,982	57,719
Purchases of securities	(29,704)	(65,576)
Purchases of premises and equipment - net	(2,659)	(3,989)
Net cash used in investing activities	(130,479)	(96,875)
FINANCING ACTIVITIES
Increase (decrease) in deposits	55,248	(6,176)
Proceeds from Federal Home Loan Bank borrowings	115,532
Repayment of Federal Home Loan Bank borrowings	(16,368)	(50,415)
(Decrease) increase in other short-term borrowings	(35,609)	1,813
(Decrease) increase in federal funds purchased	(20,000)	56,000
Repayment of junior subordinated debt		(7,732)
Dividends paid to common shareholders	(12,256)	(10,811)
Treasury shares sold (purchased) - net	1,489	(274)
Issuance of common stock		920
Net cash provided by (used in) financing activities	88,036	(16,675)
Net decrease in cash and cash equivalents	(1,063)	(47,535)
Cash and cash equivalents at beginning of the period	95,551	125,605
Cash and cash equivalents at end of the period	94,488	78,070
SUPPLEMENTAL DISCLOSURES
Interest paid on deposits and other borrowings	12,532	17,549
Income taxes paid	7,850	11,425
Transfers of loans to other real estate owned	$ 1,610	$ 1,084