Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash flows from operating activities:
Net income	$ 10,947	$ 10,409
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	946	1,061
Net gain on sale of other real estate owned	(191)	0
Writedown of other real estate owned	188	346
Provision for loan losses	600	800
Deferred tax expense (benefit)	368	(179)
Net amortization of securities	1,114	1,152
Stock based compensation expense	42	56
Net loss on sale of bank premises and equipment	0	3
(Increase) decrease in taxes receivable	(411)	4,703
Decrease in interest receivable	328	264
(Decrease) increase in interest payable	(16)	48
Increase in other assets	(997)	(632)
Decrease in accrued expenses and other liabilities	(1,602)	(1,912)
Total adjustments	369	5,710
Net cash provided by operating activities	11,316	16,119
Cash flows from investing activities:
Proceeds from sales and calls of securities available for sale	20,770	48,913
Proceeds from calls and maturities of held to maturity securities	2,220	2,891
Purchases of securities available for sale	(47,905)	(31,121)
Net increase in loans	(19,579)	(10,275)
Proceeds from dispositions of other real estate owned	1,867	1,461
Proceeds from dispositions of bank premises and equipment	0	18
Purchases of bank premises and equipment	(655)	(799)
Net cash (used in) provided by investing activities	(43,282)	11,088
Cash flows from financing activities:
Net increase in deposits	2,306	42,110
Net increase (decrease) in short-term borrowings	11,540	(21,698)
Proceeds from exercise of stock options	1,503	0
Stock based award tax withholding payments	(312)	0
Proceeds from sale of treasury stock	633	655
Purchases of treasury stock	(1,503)	0
Dividends paid	(6,284)	(6,252)
Net cash provided by financing activities	7,883	14,815
Net (decrease) increase in cash and cash equivalents	(24,083)	42,022
Cash and cash equivalents at beginning of period	707,274	718,156
Cash and cash equivalents at end of period	683,191	760,178
Cash paid during the year for:
Interest paid	3,668	3,796
Income taxes paid	6,150	1,360
Other non cash items:
Transfer of loans to other real estate owned	787	1,036
Increase in dividends payable	7	7
Change in unrealized gain on securities available for sale-gross of deferred taxes	1,179	8,035
Change in deferred tax effect on unrealized gain on securities available for sale	(472)	(3,214)
Amortization of net actuarial (gain) loss and prior service cost on pension and postretirement plans	(40)	56
Change in deferred tax effect of amortization of net actuarial (gain) loss and prior service cost on pension and postretirement plans	$ 16	$ (23)