Consolidated Condensed Statements Of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Operating activities:
Net Income (Loss) Attributable to Parent	$ 117,397	$ 82,723
Adjustments to reconcile net income to net cash provided by operating activities:
(Recovery of) provision for credit losses	(6,923)	31,213
Amortization of Deferred Loan Origination Fees, Net	(20,601)	(12,191)
Depreciation	9,951	7,888
Amortization of investment securities, net	1,442	1,064
Depreciation, Amortization and Accretion, Net	(1,375)	(2,005)
Gain (Loss) on Sale of Investments	0	(3,286)
(Gain) loss on equity securities, net	(2,886)	749
Loan originations to be sold in secondary market	(465,278)	(697,555)
Proceeds from sale of loans in secondary market	503,032	676,275
Share-based compensation expense	4,496	3,749
Loss (gain) on sale of OREO, net	26	(1,214)
Bank owned life insurance income	(3,776)	(3,619)
Investment in qualified affordable housing tax credits amortization	5,567	5,487
Changes in assets and liabilities:
Increase in other assets	(11,021)	(5,794)
Increase (decrease) in other liabilities	986	(8,452)
Net cash provided by operating activities	112,635	52,436
Investing activities:
Payments for (Proceeds from) Federal Home Loan Bank Stock	8,677	7,639
Proceeds from Sale of Debt Securities, Available-for-sale	934	312,159
Proceeds from Sale, Maturity and Collection of Investments [Abstract]
Available-for-sale securities	176,926	164,725
Payments to Acquire Investments [Abstract]
Payments to Acquire Debt Securities, Available-for-sale	(637,123)	(267,210)
Equity securities	0	(3,567)
Payments to Acquire Other Investments	2,655	201
Net loan originations, portfolio loans	269,353	(727,387)
Proceeds from Sale of Other Assets, Investing Activities	3,688	0
Payments for Affordable Housing Programs	(6,182)	(4,301)
Proceeds from the sale of OREO	659	5,595
Life insurance death benefits	4,862	1,196
Purchases of premises and equipment	(10,670)	(20,820)
Net cash used in investing activities	(186,221)	(531,770)
Financing activities:
Net increase in deposits	900,305	1,196,684
Increase (Decrease) in Other Deposits	(108,239)	(773,273)
Net (decrease) increase in short-term borrowings	(106,251)	89,778
Proceeds from Issuance of Subordinated Long-term Debt	0	172,620
Repayments of Long-term Debt	(32,500)	(57,500)
Payment, Tax Withholding, Share-based Payment Arrangement	(2,403)	(1,002)
Repurchase of common shares to be held as treasury shares	(16,048)	(7,507)
Cash dividends paid	(54,357)	(53,713)
Net cash provided by financing activities	580,507	566,087
Increase in cash and cash equivalents	506,921	86,753
Cash and cash equivalents at beginning of year	370,474	159,956
Cash and cash equivalents at end of period	877,395	246,709
Supplemental disclosures of cash flow information:
Cash paid for interest	14,930	24,600
Income Taxes Paid	16,430	17,400
Non cash activities:
Real Estate Owned, Transfer to Real Estate Owned	78	1,124
Other Significant Noncash Transaction, Value of Consideration Received	547	7,794
Affordable Housing Program Obligation, Period Increase (Decrease)	10,000	10,000
Transfer to Investments	52,508	0
Consumer Portfolio Segment [Member]
Changes in assets and liabilities:
Increase in prepaid dealer premiums	(3,370)	(7,889)
Mortgage Loans on Real Estate [Member]
Adjustments to reconcile net income to net cash provided by operating activities:
Gain on sale of loans in secondary market	$ 15,032	$ 14,707