Derivative Instruments - Summary of Derivative Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Derivatives
Notional Amount
Derivative Assets	320,937	106,642
Derivative Liabilities	23,562	14,312
Derivative asset netting	(4,834)	(540)
Derivative liability netting	(2,584)	(5,109)
Total derivative assets, net	316,103	106,102
Total derivative liabilities, net	20,978	9,203
Other assets
Derivatives
Derivative Assets	320,937	106,642
Derivative asset netting	(4,834)	(540)
Total derivative assets, net	316,103	106,102
Accrued expenses and other liabilities
Derivatives
Derivative Liabilities	23,562	14,312
Derivative liability netting	(2,584)	(5,109)
Total derivative liabilities, net	20,978	9,203
Derivatives designated as hedges
Derivatives
Notional Amount
Derivatives designated as hedges | Other assets
Derivatives
Derivative Assets	2,311	0
Derivatives designated as hedges | Accrued expenses and other liabilities
Derivatives
Derivative Liabilities	46	3,419
Derivatives not designated as hedges
Derivatives
Notional Amount
Derivatives not designated as hedges | Other assets
Derivatives
Derivative Assets	318,626	106,642
Derivatives not designated as hedges | Accrued expenses and other liabilities
Derivatives
Derivative Liabilities	23,516	10,893
Interest rate contracts
Derivatives
Derivative Assets	299,207	102,893
Derivative Liabilities	16,313	6,040
Derivative asset netting	(2,252)	(492)
Derivative liability netting	(2,252)	(491)
Total derivative assets, net	296,955	102,401
Total derivative liabilities, net	14,061	5,549
Interest rate contracts | Derivatives designated as hedges
Derivatives
Notional Amount	150,000	150,000
Interest rate contracts | Derivatives designated as hedges | Other assets
Derivatives
Derivative Assets	0	0
Interest rate contracts | Derivatives designated as hedges | Accrued expenses and other liabilities
Derivatives
Derivative Liabilities	46	168
Interest rate contracts | Derivatives not designated as hedges
Derivatives
Notional Amount	5,895,881	5,095,969
Interest rate contracts | Derivatives not designated as hedges | Other assets
Derivatives
Derivative Assets	299,207	102,893
Interest rate contracts | Derivatives not designated as hedges | Accrued expenses and other liabilities
Derivatives
Derivative Liabilities	16,267	5,872
Risk participation agreements
Derivatives
Derivative Assets	88	202
Derivative Liabilities	123	354
Derivative asset netting	0	0
Derivative liability netting	0	0
Total derivative assets, net	88	202
Total derivative liabilities, net	123	354
Risk participation agreements | Derivatives not designated as hedges
Derivatives
Notional Amount	428,623	316,353
Risk participation agreements | Derivatives not designated as hedges | Other assets
Derivatives
Derivative Assets	88	202
Risk participation agreements | Derivatives not designated as hedges | Accrued expenses and other liabilities
Derivatives
Derivative Liabilities	123	354
Forward foreign exchange contracts
Derivatives
Derivative Assets	2,519	0
Derivative Liabilities	1,764	6,519
Derivative asset netting	(2,518)	0
Derivative liability netting	(55)	(4,214)
Total derivative assets, net	1	0
Total derivative liabilities, net	1,709	2,305
Forward foreign exchange contracts | Derivatives designated as hedges
Derivatives
Notional Amount	176,195	177,593
Forward foreign exchange contracts | Derivatives designated as hedges | Other assets
Derivatives
Derivative Assets	2,311	0
Forward foreign exchange contracts | Derivatives designated as hedges | Accrued expenses and other liabilities
Derivatives
Derivative Liabilities	0	3,251
Forward foreign exchange contracts | Derivatives not designated as hedges
Derivatives
Notional Amount	107,691	262,656
Forward foreign exchange contracts | Derivatives not designated as hedges | Other assets
Derivatives
Derivative Assets	208	0
Forward foreign exchange contracts | Derivatives not designated as hedges | Accrued expenses and other liabilities
Derivatives
Derivative Liabilities	1,764	3,268
Interest rate lock commitments
Derivatives
Derivative Assets	18,525	2,772
Derivative Liabilities	1	20
Derivative asset netting	(1)	(7)
Derivative liability netting	(1)	(7)
Total derivative assets, net	18,524	2,765
Total derivative liabilities, net	0	13
Interest rate lock commitments | Derivatives not designated as hedges
Derivatives
Notional Amount	638,942	158,111
Interest rate lock commitments | Derivatives not designated as hedges | Other assets
Derivatives
Derivative Assets	18,525	2,772
Interest rate lock commitments | Derivatives not designated as hedges | Accrued expenses and other liabilities
Derivatives
Derivative Liabilities	1	20
Forward loan sales commitments
Derivatives
Derivative Assets	63	41
Derivative Liabilities	4,613	289
Derivative asset netting	(63)	(41)
Derivative liability netting	(63)	(41)
Total derivative assets, net	0	0
Total derivative liabilities, net	4,550	248
Forward loan sales commitments | Derivatives not designated as hedges
Derivatives
Notional Amount	911,872	174,013
Forward loan sales commitments | Derivatives not designated as hedges | Other assets
Derivatives
Derivative Assets	63	41
Forward loan sales commitments | Derivatives not designated as hedges | Accrued expenses and other liabilities
Derivatives
Derivative Liabilities	4,613	289
Power Equity CDs
Derivatives
Derivative Assets	535	734
Derivative Liabilities	535	734
Derivative asset netting	0	0
Derivative liability netting	0	0
Total derivative assets, net	535	734
Total derivative liabilities, net	535	734
Power Equity CDs | Derivatives not designated as hedges
Derivatives
Notional Amount	24,937	29,009
Power Equity CDs | Derivatives not designated as hedges | Other assets
Derivatives
Derivative Assets	535	734
Power Equity CDs | Derivatives not designated as hedges | Accrued expenses and other liabilities
Derivatives
Derivative Liabilities	535	734
Swap agreement
Derivatives
Derivative Liabilities	213	356
Derivative liability netting	(213)	(356)
Total derivative liabilities, net	0	0
Swap agreement | Derivatives not designated as hedges
Derivatives
Notional Amount	12,652	12,652
Swap agreement | Derivatives not designated as hedges | Other assets
Derivatives
Derivative Assets	0	0
Swap agreement | Derivatives not designated as hedges | Accrued expenses and other liabilities
Derivatives
Derivative Liabilities	$ 213	$ 356