CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Loans and Leases Receivable, Net of Deferred Income	$ 9,933,969	$ 9,900,970
ASSETS
Cash and due from banks	210,191	231,054
Interest-bearing deposits with other banks	19,180	20,305
Investment securities available-for-sale, at fair value (amortized cost $3,698,779 at March 31, 2021 and $3,330,029 at December 31, 2020)	3,753,763	3,424,580
Investment securities held-to-maturity (fair value $124,294 at March 31, 2021 and $136,698 at December 31, 2020)	121,945	131,687
Other investments	131,814	133,198
Loans held for sale	34,590	41,103
Loans
Total loans and leases	9,933,969	9,900,970
Loans and Leases Receivable, Allowance	169,923	175,679
Net loans and leases	9,764,046	9,725,291
Premises and equipment	204,537	207,211
Goodwill	937,771	937,771
Other Finite-Lived Intangible Assets, Gross	61,984	64,552
Accrued interest and other assets	935,250	1,056,382
Total assets	16,175,071	15,973,134
Deposits
Interest-bearing	2,914,761	2,914,787
Savings	4,006,181	3,680,774
Time	1,731,757	1,872,733
Total interest-bearing deposits	8,652,699	8,468,294
Noninterest-bearing	3,995,370	3,763,709
Total deposits	12,648,069	12,232,003
Federal funds purchased and securities sold under agreements to repurchase	181,387	166,594
FHLB short-term borrowings	0	0
Long-term debt	583,722	776,202
Total borrowed funds	765,109	942,796
Accrued interest and other liabilities	502,951	516,265
Total liabilities	13,916,129	13,691,064
SHAREHOLDERS' EQUITY
Common stock - no par value Authorized - 160,000,000 shares Issued - 104,281,794 shares in 2020 and 2019	1,633,137	1,638,947
Retained earnings	745,220	720,429
Accumulated other comprehensive loss	18,101	48,664
Treasury stock, at cost, 6,764,101 shares in 2021 and 6,259,865 shares in 2020	(137,516)	(125,970)
Total shareholders' equity	2,258,942	2,282,070
Total liabilities and shareholders' equity	16,175,071	15,973,134
Commercial real estate
Loans and Leases Receivable, Net of Deferred Income	4,396,582	4,307,858
Loans
Total loans and leases	4,396,582	4,307,858
Construction real estate
Loans and Leases Receivable, Net of Deferred Income	642,709	636,096
Loans
Total loans and leases	642,709	636,096
Commercial
Loans and Leases Receivable, Net of Deferred Income	3,044,825	3,007,509
Loans
Total loans and leases	3,044,825	3,007,509
Lease financing
Loans and Leases Receivable, Net of Deferred Income	66,574	72,987
Loans
Total loans and leases	66,574	72,987
Residential real estate
Loans and Leases Receivable, Net of Deferred Income	946,522	1,003,086
Loans
Total loans and leases	946,522	1,003,086
Home equity
Loans and Leases Receivable, Net of Deferred Income	709,667	743,099
Loans
Total loans and leases	709,667	743,099
Installment
Loans and Leases Receivable, Net of Deferred Income	82,421	81,850
Loans
Total loans and leases	82,421	81,850
Credit card
Loans and Leases Receivable, Net of Deferred Income	44,669	48,485
Loans
Total loans and leases	$ 44,669	$ 48,485