Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Assets
Cash and due from banks	$ 350,967	$ 367,084
Interest-bearing deposits in other banks	348,526	667,560
Investment securities	4,595,301	5,234,658
Loans held for sale		556
Loans and leases	12,600,464	12,277,369
Less: allowance for loan and lease losses	141,250	137,253
Net loans and leases	12,459,214	12,140,116
Premises and equipment, net	286,374	289,215
Other real estate owned and repossessed personal property	362	329
Accrued interest receivable	49,407	47,987
Bank-owned life insurance	444,987	438,010
Goodwill	995,492	995,492
Mortgage servicing rights	16,937	13,196
Other assets	436,271	355,258
Total assets	19,983,838	20,549,461
Deposits:
Interest-bearing	10,881,918	11,485,269
Noninterest-bearing	5,807,355	6,126,853
Total deposits	16,689,273	17,612,122
Short-term borrowings	30,000
Long-term borrowings	400,026	34
Retirement benefits payable	135,523	134,218
Other liabilities	305,554	270,536
Total liabilities	17,560,376	18,016,910
Commitments and contingent liabilities (Note 14)
Stockholders' equity
Common stock ($0.01 par value; authorized 300,000,000 shares; issued/outstanding: 139,655,841 / 134,873,728 as of September 30, 2018; issued/outstanding: 139,599,454 / 139,588,782 as of December 31, 2017)	1,397	1,396
Additional paid-in capital	2,494,436	2,488,643
Retained earnings	264,463	139,177
Accumulated other comprehensive loss, net	(204,699)	(96,383)
Treasury stock (4,782,113 shares as of September 30, 2018 and 10,672 shares as of December 31, 2017)	(132,135)	(282)
Total stockholders' equity	2,423,462	2,532,551
Total liabilities and stockholders' equity	$ 19,983,838	$ 20,549,461