CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
OPERATING ACTIVITIES
Net Income	$ 98,234	$ 105,334	$ 72,968
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	14,873	14,995	13,883
Provision (recovery) for unfunded loan commitments	436	(54)	(410)
Net depreciation, amortization and accretion	5,763	4,599	2,498
Net amortization of discounts and premiums on securities	3,243	3,180	4,003
Stock-based compensation expense	2,441	1,891	3,008
Loss (gain) on sale of securities	26	0	(3,000)
Gain on sale of bank branch	0	0	(1,042)
Deferred income taxes	(381)	3,509	13,832
Loss (gain) on sale of fixed assets	37	(81)	128
Gain on the sale of mortgage loans, net	(1,887)	(1,537)	(1,551)
Gain on the sale of majority interest of insurance business	0	(1,873)	0
Pension contribution	0	(20,420)	0
Mortgage loans originated for sale	(109,624)	(90,142)	(93,382)
Proceeds from sale of loans	109,082	93,793	93,991
Net increase in interest receivable	(3,768)	(1,635)	(2,714)
Net (decrease) increase in interest payable	(2,223)	2,353	1,349
Net (increase) decrease in other assets	(2,325)	9,948	5,634
Net increase in other liabilities	24,496	4,157	5,041
Net Cash Provided by Operating Activities	138,423	128,017	114,236
INVESTING ACTIVITIES
Proceeds from maturities, prepayments and calls of securities	92,412	89,833	80,956
Proceeds from sales of securities	59,934	0	65,801
Purchases of securities	(129,973)	(92,597)	(156,839)
Net sales (purchases) of Federal Home Loan Bank stock	6,615		2,547
Net sales (purchases) of Federal Home Loan Bank stock		(165)
Net increase in loans	(298,741)	(207,233)	(211,766)
Proceeds from the sale of loans not originated for resale	520	7,695	6,754
Purchases of premises and equipment	(5,153)	(4,172)	(4,694)
Proceeds from the sale of premises and equipment	71	135	422
Net cash acquired from bank merger	63,759	0	0
Net Cash Used in Investing Activities	(210,556)	(201,964)	(212,415)
FINANCING ACTIVITIES
Net increase in core deposits	423,203	231,756	166,054
Net (decrease) increase in certificates of deposit	(27,632)	14,397	27,132
Net decrease in short-term borrowings	(200,000)	(70,000)	(120,000)
Net increase (decrease) in securities sold under repurchase agreements	1,505	(31,778)	(671)
Proceeds from long-term borrowings	10,000	25,000	35,000
Repayments of long-term borrowings	(35,936)	(1,987)	(2,412)
Treasury shares issued-net	(915)	(657)	(689)
Repurchase common stock	(18,222)	(12,256)	0
Common stock issuance costs	(176)	0	0
Cash dividends paid to common shareholders	(37,360)	(34,539)	(28,569)
Repurchase warrant	0	(7,652)	0
Net Cash Provided by Financing Activities	114,467	112,284	75,845
Net increase (decrease) in cash and cash equivalents	42,334	38,337	(22,334)
Cash and cash equivalents at beginning of year	155,489	117,152	139,486
Cash and Cash Equivalents at End of Year	197,823	155,489	117,152
Supplemental Disclosures
Transfers to other real estate owned and other repossessed assets	2,592	870	2,238
Interest paid	75,278	53,035	33,591
Income taxes paid, net of refunds	14,663	15,728	33,814
Loans transferred to held for sale	456	0	0
Loans transferred to portfolio from held for sale	0	7,695	250
Transfer retained assets from sale to investment in insurance company partnership	0	1,917	0
Net assets from acquisitions, excluding cash and cash equivalents	43,637	0	0
Decrease in cash and cash equivalents from sale of bank branch	0	0	154
Branch
INVESTING ACTIVITIES
Proceeds from the divestiture of businesses	0	0	4,404
Majority Interest of Insurance Business
Adjustments to reconcile net income to net cash provided by operating activities:
Gain on the sale of majority interest of insurance business	0	(1,873)	0
INVESTING ACTIVITIES
Proceeds from the divestiture of businesses	$ 0	$ 4,540	$ 0