Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Cash flows from operating activities:
Net income	$ 18,931	$ 17,975
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	2,541	2,507
Loss on sale of other real estate owned	36	356
Writedown of other real estate owned	1,098	474
Provision for loan losses	4,000	6,100
Deferred tax benefit	(27)	(160)
Stock based compensation expense	171	179
Net gain on sale of bank premises and equipment	(16)	(2)
Net gain on sales and calls of securities	(1,434)	(732)
Increase in taxes receivable	(1,329)	(1,883)
Decrease (increase) in interest receivable	(332)	1,044
Decrease in interest payable	(24)	(120)
Decrease in other assets	6,272	1,583
Increase in accrued expenses and other liabilities	1,610	635
Total adjustments	12,566	9,981
Net cash provided by operating activities	31,497	27,956
Cash flows from investing activities:
Proceeds from sales and calls of securities available for sale	323,974	601,747
Proceeds from calls and maturities of held to maturity securities	44,637	57,836
Purchases of securities available for sale	(329,374)	(795,544)
Proceeds from maturities of securities available for sale	10,050	914
Purchases of held to maturity securities	0	(10,303)
Purchases of Federal Reserve Bank and Federal Home Loan Bank stock	(868)	0
Net increase in loans	(89,783)	(50,131)
Proceeds from dispositions of other real estate owned	4,978	5,579
Proceeds from dispositions of bank premises and equipment	16	2
Purchases of bank premises and equipment	(4,603)	(3,369)
Net cash used in investing activities	(40,973)	(193,269)
Cash flows from financing activities:
Net increase in deposits	88,683	162,677
Net increase in short-term borrowings	16,479	3,155
Proceeds from sale of treasury stock	1,468	1,446
Dividends paid	(12,338)	(12,270)
Net cash provided by financing activities	94,292	155,008
Net decrease in cash and cash equivalents	84,816	(10,305)
Cash and cash equivalents at beginning of period	544,016	532,943
Cash and cash equivalents at end of period	628,832	522,638
Cash paid during the year for:
Interest paid	7,680	11,464
Income taxes paid	12,691	12,461
Other non cash items:
Transfer of loans to other real estate owned	7,752	5,014
Increase in dividends payable	18	17
Change in unrealized gain (loss) on securities available for sale - gross of deferred taxes	(30,688)	6,719
Change in deferred tax effect on unrealized gain (loss) on securities available for sale	12,237	(2,679)
Amortization of net actuarial loss and prior service credit on pension and postretirement plans	102	63
Change in deferred tax effect of amortization of net actuarial loss and prior service credit	$ (40)	$ (25)