Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Operating Activities:
Net Income	$ 50,368	$ 43,241
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities:
Provision for Credit Losses	1,250	2,000
Depreciation and Amortization	1,971	2,117
Net Amortization of Investment Security Premiums & Discounts	1,133	741
Amortization of Core Deposit Intangible	458	470
Accretion of Discount on Acquired Loans	(62)	(134)
Net (Gain) on Sale of Investment Securities	(2,554)	(13)
Net (Gain) on Sale of Property & Equipment	(31)	(38)
Net Change in Operating Assets & Liabilities:
Net (Increase) in Interest Receivable and Other Assets	(11,211)	(6,269)
Net Increase (Decrease) in Interest Payable and Other Liabilities	10,738	(1,773)
Net Cash Provided by Operating Activities	52,060	40,342
Investing Activities:
Purchase of Investment Securities Available-for-Sale	(257,228)	(273,408)
Proceeds from Sold, Matured or Called Securities Available-for-Sale	397,454	225,332
Purchase of Investment Securities Held-to-Maturity	(194,332)	(19,056)
Proceeds from Matured or Called Securities Held-to-Maturity	29,042	9,341
Net Loans & Leases Paid, Originated or Acquired	(39,956)	(438,984)
Additions to Premises and Equipment, Net	(1,001)	(6,108)
Purchase of Other Investments	(4,516)	(4,935)
Redemption of Other Investment	2,556	0
Proceeds from Sale of Property & Equipment	635	81
Net Cash Used in Investing Activities	(67,346)	(507,737)
Financing Activities:
Net Increase in Deposits	508,127	536,758
Cash Dividends	(5,922)	(5,753)
Cash Dividends Return	7	0
Net Cash Provided by Financing Activities	502,212	531,005
Net Change in Cash and Cash Equivalents	486,926	63,610
Cash and Cash Equivalents at Beginning of Period	383,837	294,758
Cash and Cash Equivalents at End of Period	870,763	358,368
Supplementary Data
Cash Payments Made for Income Taxes	22,530	7,443
Issuance of Common Stock to the Bank's Non-Qualified Retirement Plans	0	403
Interest Paid	4,369	9,085
Supplementary Noncash Disclosure
Investment Securities Available-for-Sale Transferred to Held-to-Maturity	316,925	0
Lease Liabilities Arising from Obtaining Right-of-Use Assets	$ 302	$ 0