Consolidated Statements Of Cash Flows - USD ($)	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash Flows From Operating Activities:
Net income	$ 32,368,000	$ 31,483,000
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	279,000	547,000
Credit for deferred income taxes	(470,000)	(1,791,000)
Depreciation and amortization of premises and equipment	3,006,000	3,031,000
Amortization of right of use asset - operating leases	1,597,000
Premium amortization on investment securities, net	949,000	1,458,000
Net loss on sales of securities		4,960,000
Stock-based compensation expense	2,064,000	1,526,000
Common stock issued in lieu of cash for director fees	87,000	47,000
Accretion of cash surrender value on bank-owned life insurance	(1,633,000)	(1,589,000)
Pension expense (credit)	303,000	(239,000)
Decrease in other assets	443,000	1,549,000
Increase (decrease) in accrued expenses and other liabilities	(2,124,000)	2,431,000
Net cash provided by operating activities	36,869,000	43,413,000
Cash Flows From Investing Activities:
Proceeds from sales of available-for-sale securities		169,631,000
Proceeds from maturities and redemptions of investment securities:
Held-to-maturity	3,107,000	3,786,000
Available-for-sale	90,014,000	60,152,000
Purchases of investment securities:
Held-to-maturity	(1,569,000)	(2,955,000)
Available-for-sale	(44,981,000)	(336,051,000)
Net decrease (increase) in loans	65,004,000	(272,394,000)
Proceeds from sale of other real estate owned		5,125,000
Net decrease (increase) in restricted stock	10,552,000	(627,000)
Purchases of premises and equipment, net	(2,144,000)	(3,208,000)
Purchases of bank-owned life insurance		(20,000,000)
Net cash provided by (used in) investing activities	119,983,000	(396,541,000)
Cash Flows From Financing Activities:
Net increase in deposits	141,851,000	338,512,000
Net (decrease) increase in short-term borrowings	(237,298,000)	11,035,000
Proceeds from long-term debt	48,945,000	39,680,000
Repayment of long-term debt	(50,500,000)	(60,450,000)
Proceeds from issuance of common stock, net	1,624,000	17,017,000
Proceeds from exercise of stock options	265,000	153,000
Shares withheld upon the vesting and conversion of RSUs	(830,000)	(767,000)
Repurchase of common stock	(31,489,000)
Cash dividends paid	(12,890,000)	(11,262,000)
Net cash (used in) provided by financing activities	(140,322,000)	333,918,000
Net increase (decrease) in cash and cash equivalents	16,530,000	(19,210,000)
Cash and cash equivalents, beginning of year	47,358,000	69,672,000
Cash and cash equivalents, end of period	63,888,000	50,462,000
Supplemental Cash Flow Disclosures:
Cash paid for interest	33,161,000	25,261,000
Cash paid for income taxes	6,557,000	2,490,000
Operating cash flows from operating leases	1,891,000
Noncash investing and financing activities:
Right-of-use assets obtained in exchange for operating lease liabilities	16,483,000
Cash dividends payable	$ 4,358,000	$ 4,438,000