Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Cash flows from operating activities:
Net income	$ 31,803	$ 32,058
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	3,071	3,469
Net gain on sale of other real estate owned	(281)	(354)
Writedown of other real estate owned	911	781
Provision for loan losses	2,350	2,400
Deferred tax expense	3,899	2,832
Net amortization of securities	3,702	4,134
Stock based compensation expense	168	144
Net gain on sale of bank premises and equipment	(480)	0
Net gain on sales of securities	(668)	(249)
Decrease in taxes receivable	2,320	3,599
(Increase) decrease in interest receivable	(610)	453
Decrease in interest payable	(5)	(40)
Increase in other assets	(4,844)	(3,400)
(Decrease) increase in accrued expenses and other liabilities	(297)	2,713
Total adjustments	9,236	16,482
Net cash provided by operating activities	41,039	48,540
Cash flows from investing activities:
Proceeds from sales and calls of securities available for sale	205,312	185,159
Proceeds from calls and maturities of held to maturity securities	8,435	10,948
Purchases of securities available for sale	(250,554)	(132,898)
Proceeds from maturities of securities available for sale	550	1,499
Purchases of Federal Reserve Bank and Federal Home Loan Bank stock	(99)	(252)
Net increase in loans	(101,292)	(132,594)
Proceeds from dispositions of other real estate owned	4,860	5,464
Proceeds from dispositions of bank premises and equipment	674	107
Purchases of bank premises and equipment	(1,732)	(2,517)
Net cash used in investing activities	(133,846)	(65,084)
Cash flows from financing activities:
Net increase in deposits	67,860	64,552
Net decrease in short-term borrowings	(12,022)	(4,711)
Proceeds from exercise of stock options and related tax benefits	760	99
Proceeds from sale of treasury stock	1,958	2,021
Purchases of treasury stock	(701)	(99)
Dividends paid	(18,776)	(18,694)
Net cash provided by financing activities	39,079	43,168
Net increase in cash and cash equivalents	(53,728)	26,624
Cash and cash equivalents at beginning of period	718,156	671,448
Cash and cash equivalents at end of period	664,428	698,072
Cash paid during the year for:
Interest paid	11,594	12,348
Income taxes paid	16,944	14,859
Other non cash items:
Transfer of loans to other real estate owned	3,803	5,343
Increase in dividends payable	23	16
Change in unrealized gain on securities available for sale-gross of deferred taxes	11,807	5,433
Change in deferred tax effect on unrealized gain on securities available for sale	(4,723)	(2,171)
Amortization of net actuarial loss and prior service credit on pension and postretirement plans	42	121
Change in deferred tax effect of amortization of net actuarial loss and prior service credit	$ (17)	$ (48)