Derivative Instruments - Summary of Derivative Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Derivatives
Notional Amount
Derivative Assets	178,591	263,401
Derivative Liabilities	24,310	21,132
Derivative asset netting	(781)	(52)
Derivative liability netting	(627)	(1,876)
Total derivative assets, net	177,810	263,349
Total derivative liabilities, net	23,683	19,256
Other assets
Derivatives
Derivative Assets	178,591	263,401
Derivative asset netting	(781)	(52)
Total derivative assets, net	177,810	263,349
Accrued expenses and other liabilities
Derivatives
Derivative Liabilities	24,310	21,132
Derivative liability netting	(627)	(1,876)
Total derivative liabilities, net	23,683	19,256
Derivatives designated as hedges
Derivatives
Notional Amount
Derivatives designated as hedges | Other assets
Derivatives
Derivative Assets	373	59
Derivatives designated as hedges | Accrued expenses and other liabilities
Derivatives
Derivative Liabilities	1,518	1,521
Derivatives not designated as hedges
Derivatives
Notional Amount
Derivatives not designated as hedges | Other assets
Derivatives
Derivative Assets	178,218	263,342
Derivatives not designated as hedges | Accrued expenses and other liabilities
Derivatives
Derivative Liabilities	22,792	19,611
Interest rate contracts
Derivatives
Derivative Assets	164,438	248,267
Derivative Liabilities	21,945	14,681
Derivative asset netting	0	0
Derivative liability netting	0	0
Total derivative assets, net	164,438	248,267
Total derivative liabilities, net	21,945	14,681
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	59
Interest rate contracts | Derivatives designated as hedges | Accrued expenses and other liabilities
Derivatives
Derivative Liabilities	118	0
Interest rate contracts | Derivatives not designated as hedges
Derivatives
Notional Amount	6,297,778	6,140,464
Interest rate contracts | Derivatives not designated as hedges | Other assets
Derivatives
Derivative Assets	164,438	248,208
Interest rate contracts | Derivatives not designated as hedges | Accrued expenses and other liabilities
Derivatives
Derivative Liabilities	21,827	14,681
Risk participation agreements
Derivatives
Derivative Assets	27	62
Derivative Liabilities	63	125
Derivative asset netting	0	0
Derivative liability netting	0	0
Total derivative assets, net	27	62
Total derivative liabilities, net	63	125
Risk participation agreements | Derivatives not designated as hedges
Derivatives
Notional Amount	549,262	470,670
Risk participation agreements | Derivatives not designated as hedges | Other assets
Derivatives
Derivative Assets	27	62
Risk participation agreements | Derivatives not designated as hedges | Accrued expenses and other liabilities
Derivatives
Derivative Liabilities	63	125
Forward foreign exchange contracts
Derivatives
Derivative Assets	1,193	11
Derivative Liabilities	1,505	2,386
Derivative asset netting	(570)	(11)
Derivative liability netting	(130)	(1,769)
Total derivative assets, net	623	0
Total derivative liabilities, net	1,375	617
Forward foreign exchange contracts | Derivatives designated as hedges
Derivatives
Notional Amount	210,856	207,515
Forward foreign exchange contracts | Derivatives designated as hedges | Other assets
Derivatives
Derivative Assets	373	0
Forward foreign exchange contracts | Derivatives designated as hedges | Accrued expenses and other liabilities
Derivatives
Derivative Liabilities	1,400	1,521
Forward foreign exchange contracts | Derivatives not designated as hedges
Derivatives
Notional Amount	75,267	90,647
Forward foreign exchange contracts | Derivatives not designated as hedges | Other assets
Derivatives
Derivative Assets	820	11
Forward foreign exchange contracts | Derivatives not designated as hedges | Accrued expenses and other liabilities
Derivatives
Derivative Liabilities	105	865
Interest rate lock commitments
Derivatives
Derivative Assets	7,073	14,565
Derivative Liabilities	166	4
Derivative asset netting	(166)	(4)
Derivative liability netting	(166)	(4)
Total derivative assets, net	6,907	14,561
Total derivative liabilities, net	0	0
Interest rate lock commitments | Derivatives not designated as hedges
Derivatives
Notional Amount	465,180	447,278
Interest rate lock commitments | Derivatives not designated as hedges | Other assets
Derivatives
Derivative Assets	7,073	14,565
Interest rate lock commitments | Derivatives not designated as hedges | Accrued expenses and other liabilities
Derivatives
Derivative Liabilities	166	4
Forward loan sales commitments
Derivatives
Derivative Assets	5,560	37
Derivative Liabilities	45	3,411
Derivative asset netting	(45)	(37)
Derivative liability netting	(45)	(37)
Total derivative assets, net	5,515	0
Total derivative liabilities, net	0	3,374
Forward loan sales commitments | Derivatives not designated as hedges
Derivatives
Notional Amount	460,280	535,244
Forward loan sales commitments | Derivatives not designated as hedges | Other assets
Derivatives
Derivative Assets	5,560	37
Forward loan sales commitments | Derivatives not designated as hedges | Accrued expenses and other liabilities
Derivatives
Derivative Liabilities	45	3,411
Power Equity CDs
Derivatives
Derivative Assets	300	459
Derivative Liabilities	300	459
Derivative asset netting		0
Derivative liability netting		0
Total derivative assets, net	300	459
Total derivative liabilities, net	300	459
Power Equity CDs | Derivatives not designated as hedges
Derivatives
Notional Amount	10,450	16,752
Power Equity CDs | Derivatives not designated as hedges | Other assets
Derivatives
Derivative Assets	300	459
Power Equity CDs | Derivatives not designated as hedges | Accrued expenses and other liabilities
Derivatives
Derivative Liabilities	300	459
Swap agreement
Derivatives
Derivative Liabilities	286	66
Derivative liability netting	(286)	(66)
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	$ 286	$ 66