Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Assets
Cash and due from banks	$ 332,102	$ 367,084
Interest-bearing deposits in other banks	611,698	667,560
Investment securities	4,842,551	5,234,658
Loans held for sale	2,037	556
Loans and leases	12,637,686	12,277,369
Less: allowance for loan and lease losses	140,601	137,253
Net loans and leases	12,497,085	12,140,116
Premises and equipment, net	287,746	289,215
Other real estate owned and repossessed personal property	325	329
Accrued interest receivable	48,528	47,987
Bank-owned life insurance	442,449	438,010
Goodwill	995,492	995,492
Mortgage servicing rights	17,660	13,196
Other assets	402,046	355,258
Total assets	20,479,719	20,549,461
Deposits:
Interest-bearing	11,430,455	11,485,269
Noninterest-bearing	5,965,083	6,126,853
Total deposits	17,395,538	17,612,122
Long-term debt	200,034	34
Retirement benefits payable	135,139	134,218
Other liabilities	289,833	270,536
Total liabilities	18,020,544	18,016,910
Commitments and contingent liabilities (Note 13)
Stockholders' equity
Common stock ($0.01 par value; authorized 300,000,000 shares; issued/outstanding: 139,620,801 / 136,642,060 as of June 30, 2018; issued/outstanding: 139,599,454 / 139,588,782 as of December 31, 2017)	1,396	1,396
Additional paid-in capital	2,492,656	2,488,643
Retained earnings	229,615	139,177
Accumulated other comprehensive loss, net	(182,410)	(96,383)
Treasury stock (2,978,741 shares as of June 30, 2018 and 10,672 shares as of December 31, 2017)	(82,082)	(282)
Total stockholders' equity	2,459,175	2,532,551
Total liabilities and stockholders' equity	$ 20,479,719	$ 20,549,461