Derivative Instruments - Summary of Derivative Instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Derivatives
Derivative Assets	$ 106,642	$ 15,250
Derivative Liabilities	14,312	4,356
Derivative asset netting	(540)	(6,982)
Derivative liability netting	(5,109)	(991)
Total derivative assets, net	106,102	8,268
Total derivative liabilities, net	9,203	3,365
Other assets
Derivatives
Derivative Assets	106,642	15,250
Derivative asset netting	(540)	(6,982)
Total derivative assets, net	106,102	8,268
Accrued expenses and other liabilities
Derivatives
Derivative Liabilities	14,312	4,356
Derivative liability netting	(5,109)	(991)
Total derivative liabilities, net	9,203	3,365
Derivatives designated as hedging instruments | Other assets
Derivatives
Derivative Assets	0	3,373
Derivatives designated as hedging instruments | Accrued expenses and other liabilities
Derivatives
Derivative Liabilities	3,419	0
Not Designated as Hedges | Other assets
Derivatives
Derivative Assets	106,642	11,877
Not Designated as Hedges | Accrued expenses and other liabilities
Derivatives
Derivative Liabilities	10,893	4,356
Interest rate contracts
Derivatives
Derivative Assets	102,893	7,884
Derivative Liabilities	6,040	3,706
Derivative asset netting	(492)	(395)
Derivative liability netting	(491)	(395)
Total derivative assets, net	102,401	7,489
Total derivative liabilities, net	5,549	3,311
Interest rate contracts | Derivatives designated as hedging instruments
Derivatives
Notional Amount	150,000	150,000
Interest rate contracts | Derivatives designated as hedging instruments | Other assets
Derivatives
Derivative Assets	0	393
Interest rate contracts | Derivatives designated as hedging instruments | Accrued expenses and other liabilities
Derivatives
Derivative Liabilities	168	0
Interest rate contracts | Not Designated as Hedges
Derivatives
Notional Amount	5,095,969	1,030,198
Interest rate contracts | Not Designated as Hedges | Other assets
Derivatives
Derivative Assets	102,893	7,491
Interest rate contracts | Not Designated as Hedges | Accrued expenses and other liabilities
Derivatives
Derivative Liabilities	5,872	3,706
Risk participation agreements
Derivatives
Derivative Assets	202	25
Derivative Liabilities	354	26
Derivative asset netting	0	0
Derivative liability netting	0	0
Total derivative assets, net	202	25
Total derivative liabilities, net	354	26
Risk participation agreements | Not Designated as Hedges
Derivatives
Notional Amount	316,353	65,251
Risk participation agreements | Not Designated as Hedges | Other assets
Derivatives
Derivative Assets	202	25
Risk participation agreements | Not Designated as Hedges | Accrued expenses and other liabilities
Derivatives
Derivative Liabilities	354	26
Forward foreign exchange contracts
Derivatives
Derivative Assets	0	6,689
Derivative Liabilities	6,519	13
Derivative asset netting	0	(6,587)
Derivative liability netting	(4,214)	(13)
Total derivative assets, net	0	102
Total derivative liabilities, net	2,305	0
Forward foreign exchange contracts | Derivatives designated as hedging instruments
Derivatives
Notional Amount	177,593	157,271
Forward foreign exchange contracts | Derivatives designated as hedging instruments | Other assets
Derivatives
Derivative Assets	0	2,980
Forward foreign exchange contracts | Derivatives designated as hedging instruments | Accrued expenses and other liabilities
Derivatives
Derivative Liabilities	3,251	0
Forward foreign exchange contracts | Not Designated as Hedges
Derivatives
Notional Amount	262,656	254,274
Forward foreign exchange contracts | Not Designated as Hedges | Other assets
Derivatives
Derivative Assets	0	3,709
Forward foreign exchange contracts | Not Designated as Hedges | Accrued expenses and other liabilities
Derivatives
Derivative Liabilities	3,268	13
Interest rate lock commitments
Derivatives
Derivative Assets	2,772	652
Derivative Liabilities	20	28
Derivative asset netting	(7)	0
Derivative liability netting	(7)	0
Total derivative assets, net	2,765	652
Total derivative liabilities, net	13	28
Interest rate lock commitments | Not Designated as Hedges
Derivatives
Notional Amount	158,111	28,007
Interest rate lock commitments | Not Designated as Hedges | Other assets
Derivatives
Derivative Assets	2,772	652
Interest rate lock commitments | Not Designated as Hedges | Accrued expenses and other liabilities
Derivatives
Derivative Liabilities	20	28
Forward loan sales commitments
Derivatives
Derivative Assets	41
Derivative Liabilities	289
Derivative asset netting	(41)
Derivative liability netting	(41)
Total derivative assets, net	0
Total derivative liabilities, net	248
Forward loan sales commitments | Not Designated as Hedges
Derivatives
Notional Amount	174,013
Forward loan sales commitments | Not Designated as Hedges | Other assets
Derivatives
Derivative Assets	41
Forward loan sales commitments | Not Designated as Hedges | Accrued expenses and other liabilities
Derivatives
Derivative Liabilities	289
Power Equity CDs
Derivatives
Derivative Assets	734
Derivative Liabilities	734
Derivative asset netting	0
Derivative liability netting	0
Total derivative assets, net	734
Total derivative liabilities, net	734
Power Equity CDs | Not Designated as Hedges
Derivatives
Notional Amount	29,009
Power Equity CDs | Not Designated as Hedges | Other assets
Derivatives
Derivative Assets	734
Power Equity CDs | Not Designated as Hedges | Accrued expenses and other liabilities
Derivatives
Derivative Liabilities	734
Other contracts
Derivatives
Derivative Liabilities	356	583
Derivative liability netting	(356)	(583)
Total derivative liabilities, net	0	0
Other contracts | Not Designated as Hedges
Derivatives
Notional Amount	12,652	13,020
Other contracts | Not Designated as Hedges | Other assets
Derivatives
Derivative Assets	0	0
Other contracts | Not Designated as Hedges | Accrued expenses and other liabilities
Derivatives
Derivative Liabilities	$ 356	$ 583