Consolidated Statements of Operations and Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
INTEREST INCOME:
Mortgage and other loans	$ 1,467,944	$ 1,417,237	$ 1,472,020
Securities and money market investments	221,729	165,002	202,849
Total interest income	1,689,673	1,582,239	1,674,869
INTEREST EXPENSE:
Interest-bearing checking and money market accounts	167,972	98,980	62,166
Savings accounts	28,994	28,447	31,982
Certificates of deposit	182,383	102,355	76,875
Borrowed funds	279,329	222,454	216,464
Total interest expense	658,678	452,236	387,487
Net interest income	1,030,995	1,130,003	1,287,382
Net interest income after provision for (recovery of) loan losses	1,012,739	1,092,761	1,283,202
NON-INTEREST INCOME:
Fee income	29,765	31,759	32,665
Bank-owned life insurance	28,252	27,133	31,015
Mortgage banking income		19,337	27,281
Net gain on sales of loans	111	1,156	15,806
Net (loss) gain on securities	(1,994)	29,924	3,347
FDIC indemnification expense		(18,961)	(6,155)
Gain on sale of covered loans and mortgage banking operations		82,026
Other	35,424	44,506	41,613
Total non-interest income	91,558	216,880	145,572
Operating expenses:
Compensation and benefits	317,496	363,698	352,008
Occupancy and equipment	100,107	98,963	98,543
General and administrative	129,025	178,557	187,558
Total operating expenses	546,628	641,218	638,109
Amortization of core deposit intangibles		208	2,391
Merger-related expenses			11,146
Total non-interest expense	546,628	641,426	651,646
Income before income taxes	557,669	668,215	777,128
Income tax expense	135,252	202,014	281,727
Net income	422,417	466,201	495,401
Preferred stock dividends	32,828	24,621
Net income available to common shareholders	$ 389,589	$ 441,580	$ 495,401
Basic earnings per common share	$ 0.79	$ 0.90	$ 1.01
Diluted earnings per common share	$ 0.79	$ 0.90	$ 1.01
Net income	$ 422,417	$ 466,201	$ 495,401
Other comprehensive (loss) income, net of tax:
Change in net unrealized gain (loss) on securities available for sale, net of tax of $32,166; $(29,740); and $1,560, respectively	(49,732)	41,684	(2,207)
Change in the non-credit portion of OTTI losses recognized in other comprehensive (loss) income, net of tax of $(821); $(13); and $49, respectively	(821)	20	77
Change in pension and post-retirement obligations, net of tax of $(4,897); $(2,234); and $2,924, respectively	(21,943)	1,585	4,015
Less: Reclassification adjustment for sales of available-for-sale securities, net of tax of $(4); $1,245; and $1,127, respectively	10	(1,743)	(1,577)
Total other comprehensive (loss) income, net of tax	(72,486)	41,546	308
Total comprehensive income , net of tax	349,931	507,747	495,709
Non-Covered Loans
INTEREST EXPENSE:
Provision for (recovery of) losses	18,256	60,943	11,874
Covered Loans
INTEREST EXPENSE:
Provision for (recovery of) losses		$ (23,701)	$ (7,694)