Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Assets
Cash and due from banks	$ 321,319	$ 253,827
Interest-bearing deposits in other banks	793,046	798,231
Investment securities	5,314,973	5,077,514
Loans and leases	12,149,711	11,520,378
Less: allowance for loan and lease losses	137,327	135,494
Net loans and leases	12,012,384	11,384,884
Premises and equipment, net	289,689	300,788
Other real estate owned and repossessed personal property	564	329
Accrued interest receivable	44,728	41,971
Bank-owned life insurance	435,607	429,209
Goodwill	995,492	995,492
Other intangible assets	13,980	16,809
Other assets	343,845	362,775
Total assets	20,565,627	19,661,829
Deposits:
Interest-bearing	11,687,849	10,801,915
Noninterest-bearing	5,907,634	5,992,617
Total deposits	17,595,483	16,794,532
Short-term borrowings		9,151
Long-term debt	34	41
Retirement benefits payable	135,092	132,904
Other liabilities	253,160	248,716
Total liabilities	17,983,769	17,185,344
Commitments and contingent liabilities (Note 11)
Stockholders' equity
Common stock ($0.01 par value; authorized 300,000,000 shares; issued and outstanding 139,586,282 shares and 139,530,654 shares as of September 30, 2017 and December 31, 2016, respectively)	1,396	1,395
Additional paid-in capital	2,489,273	2,484,251
Retained earnings	158,303	78,850
Accumulated other comprehensive loss, net	(67,114)	(88,011)
Total stockholders' equity	2,581,858	2,476,485
Total liabilities and stockholders' equity	$ 20,565,627	$ 19,661,829