CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating Activities
Net Income	$ 105,333	$ 107,498	$ 55,165
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	14,533	12,531	5,087
Deferred Income Taxes and Tax Credits	2,292	3,473	20,825
Depreciation and amortization	10,370	8,046	8,997
Net gains on securities and other assets	(10,671)	(21,540)	(9,942)
Net amortization of premiums and discounts on securities	3,892	3,083	3,532
Income from increase in cash surrender value of bank owned life insurance	(5,998)	(5,808)	(5,699)
Mortgage loans originated for sale	(251,428)	(165,898)	(164,212)
Proceeds from Sale of Mortgage Loans Held-for-sale	251,968	177,287	163,125
Increase in interest receivable	423	(2,561)	(1,314)
Increase (decrease) in interest payable	(256)	383	426
Decrease (increase) in income taxes payable	1,484	(1,926)	1,318
Distribution from unconsolidated subsidiary	0	9,000	0
Other—net	(14,310)	11,695	10,997
Net cash provided by operating activities	107,632	135,263	88,305
Transactions with securities held to maturity:
Proceeds from Sale and Maturity of Held-to-maturity Securities	948	0	0
Proceeds from maturities and redemptions	54,632	47,614	51,239
Purchases	(200)	(20,650)	(102,420)
Transactions with securities available for sale:
Proceeds from sales	0	15,939	143,660
Proceeds from maturities and redemptions	189,194	140,707	148,561
Purchases	(138,670)	(331,969)	(150,892)
Purchases of FHLB stock	(36,850)	(52,107)	(45,301)
Proceeds from the redemption of FHLB stock	52,215	51,488	55,212
Proceeds from bank owned life insurance	557	2,140	898
Proceeds from the sale of loans	37,534	40,783	14,807
Proceeds from sales of other assets	6,822	4,477	5,568
Acquisition, net of cash acquired	332,468	705	3,188
Net increase in loans	(358,328)	(237,276)	(165,726)
Purchases of premises and equipment	(17,380)	(9,599)	(11,591)
Net cash provided by (used in) investing activities	122,942	(347,748)	(52,797)
Financing Activities
Net (decrease) increase in federal funds purchased	(11,000)	11,000	0
Net (decrease) increase in other short-term borrowings	(508,970)	3,357	(160,477)
Net increase in deposits	308,783	176,558	149,175
Repayments of other long-term debt	(634)	(23,598)	(588)
Proceeds from Issuance of Long-term Debt	50,000	98,026	0
Repayments of Long-term Capital Lease Obligations	402	373	260
Dividends paid	(39,394)	(34,849)	(30,513)
Proceeds from reissuance of treasury stock	211	208	228
Purchase of treasury stock	(6,259)	(26,189)	(1,458)
Net cash (used in) provided by financing activities	(207,665)	204,140	(43,893)
Net increase (decrease) in cash and cash equivalents	22,909	(8,345)	(8,385)
Cash and cash equivalents at January 1	98,947	107,292	115,677
Cash and cash equivalents at December 31	$ 121,856	$ 98,947	$ 107,292