Other Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Other Assets [Abstract]
Derivative asset positions	$ 401,295	$ 140,016
ROU assets	380,380	374,716
Investments in low income housing, solar energy tax credits, and other CRA partnerships	262,855	146,612
Accrued interest receivable	177,865	127,641
Federal Reserve Bank and FHLB Stock	157,520	286,447
Deferred tax asset, net	130,848	65,102
Accounts receivable	88,286	77,193
Prepaid expenses	45,088	42,285
Mutual funds and mutual funds held in rabbi trusts	37,650	32,348
MPS receivable(1)	15,575	21,437
Trading account assets, at fair value	10,880	7,212
Other real estate	1,819	14,373
Private equity investments	1,021	19,389
Taxes receivable	0	8,648
Miscellaneous other assets	49,517	55,511
Total other assets	$ 1,760,599	$ 1,418,930