CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Assets
Cash and due from banks	$ 246,716	$ 303,373
Interest-bearing deposits in other banks	1,011,753	737,571
Investment securities, at fair value (amortized cost: $8,560,733 as of December 31, 2021 and $5,985,031 as of December 31, 2020)	8,428,032	6,071,415
Loans held for sale	538	11,579
Loans and leases	12,961,999	13,279,097
Less: allowance for credit losses	157,262	208,454
Net loans and leases	12,804,737	13,070,643
Premises and equipment, net	318,448	322,401
Other real estate owned and repossessed personal property	175
Accrued interest receivable	63,158	69,626
Bank-owned life insurance	471,819	466,537
Goodwill	995,492	995,492
Mortgage servicing rights	8,302	10,731
Other assets	643,240	603,463
Total assets	24,992,410	22,662,831
Deposits:
Interest-bearing	12,422,283	11,705,609
Noninterest-bearing	9,393,863	7,522,114
Total deposits	21,816,146	19,227,723
Long-term borrowings	0	200,010
Retirement benefits payable	134,491	143,373
Other liabilities	384,861	347,621
Total liabilities	22,335,498	19,918,727
Commitments and contingent liabilities (Note 17)
Stockholders' equity
Common stock ($0.01 par value; authorized 300,000,000 shares; issued/outstanding: 140,581,715 / 127,502,472 as of December 31, 2021; issued/outstanding: 140,191,133 / 129,912,272 as of December 31, 2020)	1,406	1,402
Additional paid-in capital	2,527,663	2,514,014
Retained earnings	604,534	473,974
Accumulated other comprehensive (loss) income, net	(121,693)	31,604
Treasury stock (13,079,243 shares as of December 31, 2021 and 10,278,861 shares as of December 31, 2020)	(354,998)	(276,890)
Total stockholders' equity	2,656,912	2,744,104
Total liabilities and stockholders' equity	$ 24,992,410	$ 22,662,831