CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Statement of Cash Flows [Abstract]
Net income	$ 58,341	$ 34,944
Adjustments to reconcile net income to net cash provided by operating activities:
(Recovery of) provision for credit losses*	(627)	21,728	[1]
Depreciation of premises and equipment	2,675	2,847
Depreciation of equipment owned and leased to others	7,323	10,569
Stock-based compensation	1,726	1,519
Amortization of investment securities premiums and accretion of discounts, net	3,372	2,356
Amortization of mortgage servicing rights	1,109	1,103
Mortgage servicing rights impairment (recoveries) charges	(589)	546
Amortization of right of use assets	2,270	1,410
Deferred income taxes	8,343	(7,786)
Losses (gains) on investment securities available-for-sale	680	(279)
Originations of loans held for sale, net of principal collected	(135,647)	(154,212)
Proceeds from the sales of loans held for sale	145,785	142,680
Net gain on sale of loans held for sale	(3,706)	(4,699)
Net gain on sale of other real estate and repossessions	(303)	(9)
Change in interest receivable	1,104	(1,851)
Change in interest payable	(1,224)	(4,491)
Change in other assets	2,388	2,055
Change in other liabilities	(6,697)	(4,828)
Other	233	755
Net Cash Provided by (Used in) Operating Activities	86,556	44,357
Investing activities:
Proceeds from sales of investment securities available-for-sale	99,208	8,403
Proceeds from maturities and paydowns of investment securities available-for-sale	182,499	198,105
Purchases of investment securities available-for-sale	(515,496)	(204,415)
Net change in partnership investments	(13,756)	(30,356)
Net change in other investments	0	(2,205)
Loans sold or participated to others	15,903	8,004
Proceeds from principal payments on direct finance leases	20,086	25,238
Net change in loans and leases	(34,519)	(643,859)
Net change in equipment owned under operating leases	1,706	14,932
Purchases of premises and equipment	(947)	(2,126)
Proceeds from disposal of premises and equipment	28	12
Proceeds from sales of other real estate and repossessions	2,240	4,547
Net Cash Provided by (Used in) Investing Activities	(243,048)	(623,720)
Financing activities:
Net change in demand deposits and savings accounts	574,114	784,580
Net change in time deposits	(174,732)	(148,450)
Net change in short-term borrowings	21,703	31,126
Proceeds from issuance of long-term debt	0	10,000
Payments on long-term debt	(2,870)	(2,343)
Stock issued under stock purchase plans	90	39
Acquisition of treasury stock	(20,398)	0
Net change in noncontrolling interests	393	16,271
Cash dividends paid on common stock	(15,408)	(14,989)
Net change in financing activities	382,892	676,234
Net change in cash and cash equivalents	226,400	96,871
Cash and cash equivalents, beginning of year	243,047	83,365
Cash and cash equivalents, end of period	469,447	180,236
Non-cash transactions:
Loans transferred to other real estate and repossessed assets	1,120	2,123
Common stock matching contribution to Employee Stock Ownership and Profit Sharing Plan	715	622
Right of use assets obtained in exchange for lease obligations	$ 615	$ 31

[1] *ASU 2016-13 adopted during the fourth quarter of 2020 therefore June 30, 2020 provision amount reflects the incurred loss method.