Unaudited Condensed Consolidated Statements of Financial Condition (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Assets
Cash on hand and in banks	$ 109,746	$ 122,834
Federal funds sold	0	1,025
Interest bearing cash deposits	73,720	318,550
Cash and cash equivalents	183,466	442,409
Investment securities, available-for-sale	2,544,093	2,387,428
Investment securities, held-to-maturity	570,285	520,997
Total investment securities	3,114,378	2,908,425
Loans held for sale	54,132	46,726
Loans receivable	4,687,669	4,488,095
Allowance for loan and lease losses	(129,856)	(129,753)
Loans receivable, net	4,557,813	4,358,342
Premises and equipment, net	187,067	179,175
Other real estate owned	28,124	27,804
Accrued interest receivable	43,260	40,587
Deferred tax asset	41,220	41,737
Core deposit intangible, net	12,256	10,900
Goodwill	130,843	129,706
Non-marketable equity securities	54,277	52,868
Other assets	68,260	67,828
Total assets	8,475,096	8,306,507
Liabilities
Non-interest bearing deposits	1,675,451	1,632,403
Interest bearing deposits	4,783,341	4,712,809
Securities sold under agreements to repurchase	425,652	397,107
Federal Home Loan Bank advances	298,148	296,944
Other borrowed funds	6,703	7,311
Subordinated debentures	125,741	125,705
Accrued interest payable	3,893	4,155
Other liabilities	102,643	102,026
Total liabilities	7,421,572	7,278,460
Stockholders' Equity
Preferred shares, $0.01 par value per share, 1,000,000 shares authorized, none issued or outstanding	0	0
Common stock, $0.01 par value per share, 117,187,500 shares authorized	755	750
Paid-in capital	719,506	708,356
Retained earnings - substantially restricted	315,236	301,197
Accumulated other comprehensive income	18,027	17,744
Total stockholders' equity	1,053,524	1,028,047
Total liabilities and stockholders' equity	$ 8,475,096	$ 8,306,507
Number of common stock shares issued and outstanding	75,530,030	75,026,092