CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Statement of Cash Flows [Abstract]
Net income	$ 27,401	$ 28,106
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	2,233	2,398
Depreciation of premises and equipment	1,177	1,361
Depreciation of equipment owned and leased to others	3,015	3,773
Stock-based compensation	732	885
Amortization of investment securities premiums and accretion of discounts, net	967	1,734
Amortization of mortgage servicing rights	381	590
Mortgage servicing rights impairment recoveries	0	(42)
Amortization of right of use assets	785	1,133
Deferred income taxes	80	2,452
Gains on investment securities available-for-sale	0	0
Originations of loans held for sale, net of principal collected	(32,314)	(85,663)
Proceeds from the sales of loans held for sale	41,456	91,858
Net gain on sale of loans held for sale	(615)	(2,661)
Net gain on sale of other real estate and repossessions	(47)	(141)
Change in interest receivable	(530)	(142)
Change in interest payable	199	265
Change in other assets	9,099	(7,843)
Change in other liabilities	(10,882)	4,519
Other	(1,334)	(93)
Net Cash Provided by (Used in) Operating Activities	41,803	42,489
Investing activities:
Proceeds from sales of investment securities available-for-sale	0	0
Proceeds from maturities and paydowns of investment securities available-for-sale	57,392	119,692
Purchases of investment securities available-for-sale	(145,843)	(229,957)
Net change in partnership investments	(2,128)	(1,142)
Net change in other investments	1,651	0
Loans sold or participated to others	7,987	3,813
Proceeds from principal payments on direct finance leases	9,377	7,317
Net change in loans and leases	(66,069)	(49,255)
Net change in equipment owned under operating leases	3,626	(128)
Purchases of premises and equipment	(113)	(280)
Proceeds from disposal of premises and equipment	14	5
Proceeds from sales of other real estate and repossessions	1,983	697
Net Cash Provided by (Used in) Investing Activities	(132,123)	(149,238)
Financing activities:
Net change in demand deposits and savings accounts	26,143	271,650
Net change in time deposits	(32,116)	(86,337)
Net change in short-term borrowings	(869)	29,960
Payments on long-term debt	(2,440)	(2,035)
Acquisition of treasury stock	(2,175)	(6,621)
Net contributions from (distributions to) noncontrolling interests	1,400	639
Cash dividends paid on common stock	(7,918)	(7,600)
Net change in financing activities	(17,975)	199,656
Net change in cash and cash equivalents	(108,295)	92,907
Cash and cash equivalents, beginning of year	525,187	243,047
Cash and cash equivalents, end of period	416,892	335,954
Non-cash transactions:
Loans transferred to other real estate and repossessed assets	1,150	839
Common stock matching contribution to Employee Stock Ownership and Profit Sharing Plan	683	715
Right of use assets obtained in exchange for lease obligations	$ 116	$ 46