Consolidated Statements of Cash Flows (unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Consolidated Statements of Cash Flows [Abstract]
NET CASH PROVIDED BY OPERATING ACTIVITIES	$ 31,308	$ 20,648
INVESTING ACTIVITIES:
Net decrease in loans	3,243	8,689
Securities available-for-sale:
Proceeds from sales	3,371	3,076
Proceeds from maturities, prepayments and calls	95,683	127,531
Purchases of securities	(73,129)	(202,413)
Securities held-to-maturity:
Proceeds from maturities, prepayments and calls	21,224	29,443
Purchases of securities	(11,811)	(15,510)
Purchases of premises and equipment - net	(1,198)	(916)
Net cash provided by (used in) investing activities	37,383	(50,100)
FINANCING ACTIVITIES:
Increase in deposits	61,558	79,987
Repayment of Federal Home Loan Bank borrowings	(50,206)	(20,210)
Decrease in other short-term borrowings	(14,477)	(9,137)
Repayment of junior subordinated debt	(7,732)
Dividends paid to common shareholders	(5,260)	(4,261)
Treasury shares (purchased) sold - net		(9)
Issuance of common stock	84
Net cash (used in) provided by financing activities	(16,033)	46,370
Net increase in cash and cash equivalents	52,658	16,918
Cash and cash equivalents at beginning of the period	125,605	140,325
Cash and cash equivalents at end of the period	178,263	157,243
SUPPLEMENTAL DISCLOSURES:
Interest paid on deposits and other borrowings	9,000	11,818
Income taxes paid	2,875	650
Transfers of loans to other real estate owned	$ 472	$ 750