Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Operating Activities
Net income available to common shareholders	$ 47,249	$ 44,370
Adjustments to reconcile net income to net cash provided by operating activities:
(Accretion) and amortization, net	873	557
Provision for (recovery of) credit losses	9,222	(1,449)
Depreciation of premises and equipment	2,772	2,467
Deferred income tax expense	2,323	2,134
Net periodic employee benefit cost	362	386
Unrealized and realized investment securities losses (gains), net	2,103	(297)
Stock-compensation expense	1,702	1,374
Excess tax benefit from stock-compensation expense	(137)	(433)
Increase in value of bank-owned life insurance	(2,523)	(2,148)
Loans originated for sale	(9,372)	(9,915)
Proceeds from the sale of loans originated for sale	9,854	10,584
Gain on sale of loans	(177)	(284)
Payments for Other Operating Activities	(450)	0
Change in accrued interest receivable	(2,631)	(295)
Change in other assets	(9,515)	(1,231)
Change in other liabilities	16,334	2,600
Net Cash Provided by Operating Activities	67,989	48,420
Investing Activities
Net (increase) decrease in loans	(46,146)	68,403
Purchases	(232,478)	(113,412)
Proceeds from sales	28,548	31,597
Proceeds from maturities and calls	51,246	31,982
Securities Held-to-maturity: Proceeds from maturities and calls	0	7,427
Other investments: Purchases	(2,132)	(9,365)
Other investments: Proceeds from sales	2,282	11,857
Purchases of premises and equipment	(3,798)	(3,017)
Proceeds from bank-owned life insurance policies	1,513	2,211
Sale of Virginia Beach branch, net	0	(24,661)
Other investing activities	(142)	(3,414)
Net Cash Used in Investing Activities	(201,107)	(392)
Financing Activities
Net increase in non-interest-bearing deposits	274,382	19,696
Net increase in interest-bearing deposits	61,150	62,574
Net increase (decrease) in short-term borrowings	71,421	(54,878)
Repayment of long-term debt	4,124	0
Purchases of treasury stock	(17,864)	(12,109)
Proceeds from exercise of stock options	189	365
Dividends paid	(18,492)	(17,510)
Other financing activities	(434)	(438)
Net Cash Provided by (Used in) Financing Activities	366,228	(2,300)
Increase in Cash and Cash Equivalents	233,110	45,728
Cash and cash equivalents at beginning of period	140,144	122,991
Cash and Cash Equivalents at End of Period	373,254	168,719
Supplemental Cash Flow Information [Abstract]
Cash paid for interest	14,878	18,333
Cash paid for income taxes	$ 2,400	$ 7,025