Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities:
Net income	$ 10,715	$ 11,011
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	1,173	1,231
Net (gain) loss on sale of other real estate owned	(134)	39
Writedown of other real estate owned	259	635
Net gain on sale of building held for sale	0	(1,556)
Provision for loan losses	800	1,500
Deferred tax expense	891	1,663
Stock based compensation expense	48	87
Net gain on sale of bank premises and equipment	(1)	(1)
Net gain on sales and calls of securities	(249)	(6)
Decrease (increase) in taxes receivable	4,379	(4,950)
Decrease in interest receivable	424	255
Increase in interest payable	22	3
Increase in other assets	(1,625)	(2,992)
Decrease in accrued expenses and other liabilities	(1,390)	(4,087)
Total adjustments	4,597	(8,179)
Net cash provided by operating activities	15,312	2,832
Cash flows from investing activities:
Proceeds from sales and calls of securities available for sale	52,625	141,322
Proceeds from calls and maturities of held to maturity securities	3,686	4,079
Purchases of securities available for sale	(39,408)	(15,405)
Proceeds from maturities of securities available for sale	0	4,000
Net increase in loans	(38,670)	(37,822)
Net proceeds from sale of building held for sale	0	4,745
Proceeds from dispositions of other real estate owned	1,552	1,930
Proceeds from dispositions of bank premises and equipment	51	35
Purchases of bank premises and equipment	(1,470)	(1,550)
Net cash used in investing activities	(21,634)	101,334
Cash flows from financing activities:
Net increase in deposits	84,927	60,147
Net increase (decrease) in short-term borrowings	5,622	(8,751)
Proceeds from exercise of stock options and related tax benefits	99	0
Proceeds from sale of treasury stock	675	723
Purchases of treasury stock	(99)	0
Dividends paid	(6,224)	(6,199)
Net cash provided by financing activities	85,000	45,920
Net increase in cash and cash equivalents	78,678	150,086
Cash and cash equivalents at beginning of period	671,448	583,044
Cash and cash equivalents at end of period	750,126	733,130
Cash paid during the year for:
Interest paid	4,138	3,787
Income taxes paid	2,037	12,120
Other non cash items:
Transfer of loans to other real estate owned	2,194	3,450
Transfer of other real estate owned to fixed assets	0	568
Increase in dividends payable	4	7
Change in unrealized gain on securities available for sale-gross of deferred taxes	3,060	7,449
Change in deferred tax effect on unrealized gain on securities available for sale	(1,222)	(3,026)
Amortization of net actuarial loss and prior service credit on pension and postretirement plans	(27)	(117)
Change in deferred tax effect of amortization of net actuarial loss and prior service credit	$ 11	$ 45