Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Assets
Cash and due from banks	$ 367,084	$ 253,827
Interest-bearing deposits in other banks	667,560	798,231
Investment securities	5,234,658	5,077,514
Loans held for sale	556
Loans and leases	12,277,369	11,520,378
Less: allowance for loan and lease losses	137,253	135,494
Net loans and leases	12,140,116	11,384,884
Premises and equipment, net	289,215	300,788
Other real estate owned and repossessed personal property	329	329
Accrued interest receivable	47,987	41,971
Bank-owned life insurance	438,010	429,209
Goodwill	995,492	995,492
Other intangible assets	13,196	16,809
Other assets	355,258	362,775
Total assets	20,549,461	19,661,829
Deposits:
Interest-bearing	11,485,269	10,801,915
Noninterest-bearing	6,126,853	5,992,617
Total deposits	17,612,122	16,794,532
Short-term borrowings		9,151
Long-term debt	34	41
Retirement benefits payable	134,218	132,904
Other liabilities	270,536	248,716
Total liabilities	18,016,910	17,185,344
Commitments and contingent liabilities (Notes 14 and 18)
Stockholders' equity
Common stock ($0.01 par value; authorized 300,000,000 shares; issued/outstanding: 139,599,454 /139,588,782 as of December 31, 2017; issued and outstanding: 139,530,654 as of December 31, 2016)	1,396	1,395
Additional paid-in capital	2,488,643	2,484,251
Retained earnings	139,177	78,850
Accumulated other comprehensive loss, net	(96,383)	(88,011)
Treasury stock (10,672 shares as of December 31, 2017 and nil as of December 31, 2016)	(282)
Total stockholders' equity	2,532,551	2,476,485
Total liabilities and stockholders' equity	$ 20,549,461	$ 19,661,829