Consolidated Condensed Statements Of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Operating activities:
Net Income (Loss) Attributable to Parent	$ 81,963	$ 51,877
Adjustments to reconcile net income to net cash provided by operating activities:
(Recovery of) provision for credit losses	(8,895)	17,377
Amortization of Deferred Loan Origination Fees, Net	(13,675)	(6,151)
Depreciation	6,507	5,118
Amortization of investment securities, net	797	754
Depreciation, Amortization and Accretion, Net	(985)	(1,458)
Gain (Loss) on Sale of Investments	0	(3,313)
(Gain) loss on equity securities, net	2,277	(1,950)
Loan originations to be sold in secondary market	(336,984)	(339,525)
Proceeds from sale of loans in secondary market	367,748	244,167
Share-based compensation expense	3,323	2,585
Loss (gain) on sale of OREO, net	29	(645)
Bank owned life insurance income	(2,314)	(2,427)
Investment in qualified affordable housing tax credits amortization	3,712	3,658
Changes in assets and liabilities:
Increase in other assets	(15,609)	(4,721)
Increase (decrease) in other liabilities	10,250	(7,636)
Net cash provided by (used in) operating activities	80,171	(45,570)
Investing activities:
Payments for (Proceeds from) Federal Home Loan Bank Stock	6,549	6,242
Proceeds from Sale of Debt Securities, Available-for-sale	934	58,822
Proceeds from Sale, Maturity and Collection of Investments [Abstract]
Available-for-sale securities	119,177	95,493
Payments to Acquire Investments [Abstract]
Payments to Acquire Debt Securities, Available-for-sale	(437,800)	0
Equity securities	0	(3,364)
Payments to Acquire Other Investments	2,611	13
Net loan originations, portfolio loans	(133,037)	594,241
Proceeds from Sale of Other Assets, Investing Activities	3,688	0
Payments for Affordable Housing Programs	(6,094)	(4,131)
Proceeds from the sale of OREO	659	3,565
Life insurance death benefits	674	563
Purchases of premises and equipment	(7,814)	(14,131)
Net cash used in investing activities	(184,379)	(451,169)
Financing activities:
Net increase in deposits	744,350	1,109,440
Increase (Decrease) in Other Deposits	(102,053)	0
Net (decrease) increase in short-term borrowings	(56,369)	61,253
Repayments of Long-term Debt	(5,000)	(55,000)
Payment, Tax Withholding, Share-based Payment Arrangement	(2,244)	(875)
Repurchase of common shares to be held as treasury shares	0	(7,507)
Cash dividends paid	(37,526)	(37,034)
Net cash provided by financing activities	541,158	1,070,277
Increase in cash and cash equivalents	436,950	573,538
Cash and cash equivalents at beginning of year	370,474	159,956
Cash and cash equivalents at end of period	807,424	733,494
Supplemental disclosures of cash flow information:
Cash paid for interest	9,050	19,541
Income Taxes Paid	9,350	7,500
Non cash activities:
Real Estate Owned, Transfer to Real Estate Owned	78	295
Other Significant Noncash Transaction, Value of Consideration Received	180	7,769
Affordable Housing Program Obligation, Period Increase (Decrease)	10,000	10,000
Transfer to Investments	38,163	0
Consumer Portfolio Segment [Member]
Changes in assets and liabilities:
Increase in prepaid dealer premiums	(2,412)	(1,541)
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	$ 11,007	$ 5,639