Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
ASSETS
Cash and due from banks (restricted cash of $85,035 and $37,408)	$ 433,620	$ 335,419
Interest bearing cash and temporary investments (restricted cash of $415 and $1,232)	757,824	287,218
Total cash and cash equivalents	1,191,444	622,637
Investment securities
Equity and other, at fair value	64,764	61,841
Available for sale, at fair value	2,842,076	2,977,108
Held to maturity, at amortized cost	3,320	3,606
Loans held for sale, at fair value	355,022	166,461
Loans and leases	21,520,794	20,422,666
Allowance for loan and lease losses	(156,288)	(144,871)
Net loans and leases	21,364,506	20,277,795
Restricted equity securities	54,463	40,268
Premises and equipment, net	203,391	227,423
Operating lease right-of-use assets	108,187	0
Goodwill	1,787,651	1,787,651
Other intangible assets, net	19,750	23,964
Residential mortgage servicing rights, at fair value	151,383	169,025
Other Real Estate, Foreclosed Assets, and Repossessed Assets	4,026	10,958
Bank owned life insurance	318,533	313,626
Other assets	462,339	257,418
Total assets	28,930,855	26,939,781
Deposits
Noninterest bearing	7,123,180	6,667,467
Interest bearing	15,311,554	14,470,019
Total deposits	22,434,734	21,137,486
Securities sold under agreements to repurchase	296,717	297,151
Borrowings	1,106,674	751,788
Junior subordinated debentures, at fair value	267,798	300,870
Junior subordinated debentures, at amortized cost	88,553	88,724
Operating lease liabilities	116,924	0
Deferred tax liability, net	67,055	25,846
Other liabilities	262,884	281,474
Total liabilities	24,641,339	22,883,339
COMMITMENTS AND CONTINGENCIES (NOTE 6)
SHAREHOLDERS' EQUITY
Common stock, no par value, shares authorized: 400,000,000 in 2019 and 2018; issued and outstanding: 220,212,134 in 2019 and 220,255,039 in 2018	3,511,493	3,512,874
Retained earnings	733,059	602,482
Accumulated other comprehensive income (loss)	44,964	(58,914)
Total shareholders' equity	4,289,516	4,056,442
Total liabilities and shareholders' equity	$ 28,930,855	$ 26,939,781
Common stock, par value (in dollars per share)	$ 0	$ 0
Common stock, shares authorized	400,000,000	400,000,000
Common stock, shares issued	220,212,134	220,255,039
Common stock, shares outstanding	220,212,134	220,255,039
Cash and due from banks
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	$ 85,035	$ 37,408
Interest bearing cash and temporary investments
Restricted Cash and Cash Equivalents Items [Line Items]
Restricted cash	$ 415	$ 1,232