Consolidated Condensed Statements Of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Operating activities:
Net Income (Loss) Attributable to Parent	$ 42,831	$ 22,372
Adjustments to reconcile net income to net cash provided by operating activities:
(Recovery of) provision for credit losses	(4,855)	5,153
Amortization of Deferred Loan Origination Fees, Net	(6,334)	(1,866)
Depreciation	3,216	2,507
Amortization of investment securities, net	354	388
Depreciation, Amortization and Accretion, Net	(655)	(766)
(Gain) loss on equity securities, net	1,810	(973)
Loan originations to be sold in secondary market	(192,382)	(88,824)
Proceeds from sale of loans in secondary market	212,880	79,139
Share-based compensation expense	1,836	1,254
Loss on sale of OREO, net	33	196
Bank owned life insurance income	(1,165)	(1,248)
Investment in qualified affordable housing tax credits amortization	1,856	1,829
Changes in assets and liabilities:
Increase in other assets	(13,000)	(4,593)
Increase (decrease) in other liabilities	10,166	(5,595)
Net cash provided by operating activities	45,865	8,762
Investing activities:
Payments for (Proceeds from) Federal Home Loan Bank Stock	4,283	1,216
Proceeds from Sale of Debt Securities, Available-for-sale	934	0
Proceeds from Sale, Maturity and Collection of Investments [Abstract]
Available-for-sale securities	58,344	47,922
Payments to Acquire Investments [Abstract]
Payments to Acquire Debt Securities, Available-for-sale	(131,852)	0
Equity securities	0	(1,071)
Payments to Acquire Other Investments	1,102	0
Net loan originations, portfolio loans	2,922	6,818
Proceeds from Sale of Other Assets, Investing Activities	3,538	0
Payments for Affordable Housing Programs	(6,094)	(2,546)
Proceeds from the sale of OREO	626	383
Life insurance death benefits	674	0
Purchases of premises and equipment	(4,114)	(6,343)
Net cash (used in) provided by investing activities	(75,481)	32,743
Financing activities:
Net increase in deposits	762,896	237,611
Increase (Decrease) in Other Deposits	(99,034)	0
Net decrease in short-term borrowings	(36,845)	(37,284)
Repayments of Long-term Debt	(2,500)	(52,500)
Payment, Tax Withholding, Share-based Payment Arrangement	(1,858)	(837)
Repurchase of common shares to be held as treasury shares	0	(7,507)
Cash dividends paid	(20,242)	(20,024)
Net cash provided by financing activities	602,417	119,459
Increase in cash and cash equivalents	572,801	160,964
Cash and cash equivalents at beginning of year	370,474	159,956
Cash and cash equivalents at end of period	943,275	320,920
Supplemental disclosures of cash flow information:
Cash paid for interest	6,745	12,723
Non cash activities:
Real Estate Owned, Transfer to Real Estate Owned	78	151
Other Significant Noncash Transaction, Value of Consideration Received	0	7,755
Consumer Portfolio Segment [Member]
Changes in assets and liabilities:
Increase in prepaid dealer premiums	(508)	(219)
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	$ 6,598	$ 1,938