Allowance for Loan and Lease Losses - Summary of Changes in the Allowance for Loan and Lease Losses and Recorded Investments by Portfolio Segment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Changes in allowance for loan losses
Balance at the beginning of the period	$ 109,837	$ 113,181	$ 114,379	$ 61,082
Charge-offs	(1,221)	(1,803)	(3,364)	(4,342)
Recoveries	626	420	1,009	725
(Credit) provision for loan and lease losses excluding unfunded commitments	(2,768)	7,755	(5,550)	55,456
Balance at the end of the period	106,474	119,553	106,474	119,553
Provisions for credit losses
Provision for loan and lease losses	(2,768)	7,755	(5,550)	55,456
Unfunded commitments	(563)	(2,408)	72	4,005
Total (credit) provision for credit losses	(3,331)	5,347	(5,478)	59,461
Cumulative Effect, Period of Adoption, Adjustment
Changes in allowance for loan losses
Balance at the beginning of the period				6,632
Commercial Real Estate
Changes in allowance for loan losses
Balance at the beginning of the period	79,929	82,179	80,132	30,285
Charge-offs	(28)	0	(28)	0
Recoveries	11	94	11	94
(Credit) provision for loan and lease losses excluding unfunded commitments	(5,903)	7,738	(6,106)	47,938
Balance at the end of the period	74,009	90,011	74,009	90,011
Provisions for credit losses
Provision for loan and lease losses	(5,903)	7,738	(6,106)	47,938
Commercial Real Estate | Cumulative Effect, Period of Adoption, Adjustment
Changes in allowance for loan losses
Balance at the beginning of the period				11,694
Commercial
Changes in allowance for loan losses
Balance at the beginning of the period	25,825	26,774	29,498	24,826
Charge-offs	(1,184)	(1,794)	(3,323)	(4,321)
Recoveries	489	296	819	543
(Credit) provision for loan and lease losses excluding unfunded commitments	3,234	(338)	1,370	6,562
Balance at the end of the period	28,364	24,938	28,364	24,938
Provisions for credit losses
Provision for loan and lease losses	3,234	(338)	1,370	6,562
Commercial | Cumulative Effect, Period of Adoption, Adjustment
Changes in allowance for loan losses
Balance at the beginning of the period				(2,672)
Consumer
Changes in allowance for loan losses
Balance at the beginning of the period	4,083	4,228	4,749	5,971
Charge-offs	(9)	(9)	(13)	(21)
Recoveries	126	30	179	88
(Credit) provision for loan and lease losses excluding unfunded commitments	(99)	355	(814)	956
Balance at the end of the period	4,101	4,604	4,101	4,604
Provisions for credit losses
Provision for loan and lease losses	$ (99)	$ 355	$ (814)	956
Consumer | Cumulative Effect, Period of Adoption, Adjustment
Changes in allowance for loan losses
Balance at the beginning of the period				$ (2,390)