CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Operating activities:
Net income	$ 50,057	$ 42,561
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan and lease losses	5,358	5,091
Depreciation of premises and equipment	4,309	3,897
Depreciation of equipment owned and leased to others	18,541	16,115
Stock-based compensation	2,158	2,036
Amortization of investment securities premiums and accretion of discounts, net	4,206	4,594
Amortization of mortgage servicing rights	821	1,133
Deferred income taxes	(4,230)	82
(Gains) losses on investment securities available-for-sale	(2,757)	(790)
Originations of loans held for sale, net of principal collected	(75,387)	(88,161)
Proceeds from the sales of loans held for sale	82,572	80,474
Net gain on sale of loans held for sale	(2,336)	(2,474)
Net loss (gain) on sale of other real estate and repossessions	48	(154)
Change in interest receivable	(2,863)	(1,204)
Change in interest payable	1,293	1,089
Change in other assets	(3,054)	(2,896)
Change in other liabilities	16,445	4,820
Other	3,499	(367)
Net change in operating activities	98,680	65,846
Investing activities:
Proceeds from sales of investment securities available-for-sale	2,927	5,139
Proceeds from maturities and paydowns of investment securities available-for-sale	133,541	158,178
Purchases of investment securities available-for-sale	(181,752)	(199,056)
Proceeds from liquidation of partnership investment	0	2,903
Net change in other investments	3,495	485
Loans sold or participated to others	13,049	0
Net change in loans and leases	(269,881)	(191,881)
Net change in equipment owned under operating leases	(45,723)	(23,627)
Purchases of premises and equipment	(2,801)	(5,532)
Proceeds from sales of other real estate and repossessions	2,761	1,523
Net change in investing activities	(351,374)	(252,838)
Financing activities:
Net change in demand deposits and savings accounts	60,332	211,917
Net change in time deposits	179,620	25,935
Net change in short-term borrowings	24,822	(17,222)
Proceeds from issuance of long-term debt	19,999	10,837
Payments on long-term debt	(26,015)	(5,928)
Stock issued under stock purchase plans	153	116
Acquisition of treasury stock	(41)	(8,030)
Cash dividends paid on common stock	(15,056)	(14,530)
Net change in financing activities	243,814	203,095
Net change in cash and cash equivalents	(8,880)	16,103
Cash and cash equivalents, beginning of year	108,304	79,721
Cash and cash equivalents, end of period	99,424	95,824
Non-cash transactions:
Loans transferred to other real estate and repossessed assets	7,656	2,850
Common stock matching contribution to Employee Stock Ownership and Profit Sharing Plan	$ 1,426	$ 800