Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Cash flows from operating activities:
Net income	$ 32,058	$ 33,533
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	3,469	3,601
Net gain on sale of other real estate owned	(354)	(2,501)
Writedown of other real estate owned	781	1,447
Net gain on sale of building held for sale	0	(1,556)
Provision for loan losses	2,400	4,100
Deferred tax expense	2,832	1,546
Stock based compensation expense	144	260
Net gain on sale of bank premises and equipment	0	(1)
Net gain on sales and calls of securities	(249)	(382)
Decrease (increase) in taxes receivable	3,599	(662)
Decrease in interest receivable	453	407
Increase (decrease) in interest payable	(40)	32
Increase in other assets	(3,400)	(2,900)
Increase (decrease) in accrued expenses and other liabilities	2,713	(678)
Total adjustments	12,348	2,713
Net cash provided by operating activities	44,406	36,246
Cash flows from investing activities:
Proceeds from sales and calls of securities available for sale	189,293	268,499
Proceeds from calls and maturities of held to maturity securities	10,948	12,036
Purchases of securities available for sale	(132,898)	(118,755)
Proceeds from maturities of securities available for sale	1,499	9,002
Purchases of Federal Reserve Bank and Federal Home Loan Bank stock	(252)	(451)
Proceeds from redemptions of Federal Reserve Bank and Federal Home Loan Bank stock	0	1,723
Net increase in loans	(132,594)	(188,009)
Net proceeds from sale of building held for sale	0	4,745
Proceeds from dispositions of other real estate owned	5,464	11,276
Proceeds from dispositions of bank premises and equipment	107	98
Purchases of bank premises and equipment	(2,517)	(6,171)
Net cash used in investing activities	(60,950)	(6,007)
Cash flows from financing activities:
Net increase in deposits	64,552	57,970
Net decrease in short-term borrowings	(4,711)	(24,205)
Proceeds from exercise of stock options	99	78
Proceeds from sale of treasury stock	2,021	2,147
Purchases of treasury stock	(99)	0
Dividends paid	(18,694)	(18,618)
Net cash provided by financing activities	43,168	17,372
Net increase in cash and cash equivalents	26,624	47,611
Cash and cash equivalents at beginning of period	671,448	583,044
Cash and cash equivalents at end of period	698,072	630,655
Cash paid during the year for:
Interest paid	12,348	11,360
Income taxes paid	14,859	21,602
Other non cash items:
Transfer of loans to other real estate owned	5,343	8,487
Transfer of other real estate owned to fixed assets	0	568
Increase in dividends payable	16	21
Change in unrealized gain on securities available for sale-gross of deferred taxes	5,433	17,233
Change in deferred tax effect on unrealized gain on securities available for sale	(2,171)	(6,893)
Amortization of net actuarial gain (loss) and prior service cost on pension and postretirement plans	121	(74)
Change in deferred tax effect of amortization of net actuarial gain (loss) and prior service cost	$ (48)	$ 29