Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Operating Activities:
Net Income	$ 14,810	$ 13,738	$ 43,241	$ 41,392
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Provision for Credit Losses	1,700	0	2,000	200	$ 200
Depreciation and Amortization			2,117	2,071
Net Amortization of Investment Security Premiums & Discounts			741	365
Amortization of Core Deposit Intangible			470	479
Accretion of Discount on Acquired Loans			(134)	(22)
Net (Gain) Loss on Sale of Investment Securities	0	(1)	(13)	(1)
Net Loss (Gain) on Sale of Property & Equipment			(38)	83
Net Change in Operating Assets & Liabilities:
Net (Increase) Decrease in Interest Receivable and Other Assets			(6,269)	814
Net (Decrease) Increase in Interest Payable and Other Liabilities			(1,773)	8,789
Net Cash Provided by Operating Activities			40,342	54,170
Investing Activities:
Purchase of Investment Securities Available-for-Sale			(273,408)	(502,221)
Proceeds from Sold, Matured or Called Securities Available-for-Sale			225,332	511,590
Purchase of Investment Securities Held-to-Maturity			(19,056)	(14,271)
Proceeds from Matured or Called Securities Held-to-Maturity			9,341	8,658
Net Loans & Leases Paid, Originated or Acquired			(439,258)	(46,513)
Principal Collected on Loans & Leases Previously Charged Off			274	142
Additions to Premises and Equipment, Net			(6,108)	(1,100)
Purchase of Other Investments			(4,935)	(3,015)
Proceeds from Sale of Property & Equipment			81	41
Net Cash Used in Investing Activities			(507,737)	(46,689)
Financing Activities:
Net Increase in Deposits			536,758	76,581
Cash Dividends			(5,753)	(5,550)
Net Cash Provided by Financing Activities			531,005	71,031
Net Change in Cash and Cash Equivalents			63,610	78,512
Cash and Cash Equivalents at Beginning of Period			294,758	145,564	145,564
Cash and Cash Equivalents at End of Period	$ 358,368	$ 224,076	358,368	224,076	$ 294,758
Supplementary Data
Cash Payments Made for Income Taxes			7,443	4,782
Issuance of Common Stock to the Bank's Non-Qualified Retirement Plans			403	2,564
Interest Paid			$ 9,085	$ 8,584