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Basis of Presentation and Significant Accounting Policies - Schedule of Composition of Loans and Impact of Adoption (Details) - USD ($) $ in Thousands	Dec. 31, 2020		Jan. 01, 2020	Dec. 31, 2019		Jan. 01, 2019	Dec. 31, 2018	Dec. 31, 2017
Assets
Total loans	$ 13,786,479			$ 12,117,524
Allowance	(131,388)	[1]		(54,619)	[1]		$ (55,461)	$ (50,381)
Net loans	13,655,091			12,062,905
Shareholders' equity:
Retained earnings	783,892			682,185
Previously Reported
Assets
Total loans			$ 12,117,524	12,117,524		$ 12,117,524
Allowance			(54,619)	(54,619)		(54,619)	(55,461)
Net loans			12,062,905
Net deferred tax assets			29,705
Liabilities
Allowance for credit losses on unfunded loan commitments			2,656
Shareholders' equity:
Retained earnings			682,185
Adjustment
Assets
Total loans			4,478
Allowance			(41,347)	(41,347)
Net loans			(36,869)
Net deferred tax assets			10,268
Liabilities
Allowance for credit losses on unfunded loan commitments			4,549
Shareholders' equity:
Retained earnings			(31,150)
Adjusted Balance
Assets
Total loans	13,786,479		12,122,002
Allowance	(131,388)		(95,966)	(95,966)
Net loans	13,655,091		12,026,036
Net deferred tax assets			39,973
Liabilities
Allowance for credit losses on unfunded loan commitments			7,205
Shareholders' equity:
Retained earnings			651,035
Commercial
Assets
Total loans	3,956,422			2,890,296
Allowance	(30,567)			(21,359)			(21,742)	(19,246)
Commercial | Previously Reported
Assets
Total loans			2,815,154	2,890,296		2,815,154
Allowance			(21,359)	(22,585)		(21,359)	(21,742)
Commercial | Revision of Prior Period, Adjustment
Assets
Total loans						(75,142)
Allowance						1,226
Commercial | Adjustment
Assets
Total loans	(198,722)		2,679
Allowance			(7,150)	(7,150)
Commercial | Adjusted Balance
Assets
Total loans	3,757,700		2,817,833
Allowance			(28,509)	(28,509)
Commercial real estate
Assets
Total loans	5,946,512			5,166,792
Allowance	(75,810)			(20,535)			(23,470)	(21,436)
Commercial real estate | Previously Reported
Assets
Total loans			4,889,253	5,166,792		4,889,253
Allowance			(20,535)	(21,588)		(20,535)	(23,470)
Commercial real estate | Revision of Prior Period, Adjustment
Assets
Total loans						(277,539)
Allowance						1,053
Commercial real estate | Adjustment
Assets
Total loans	(171,701)		1,637
Allowance			(25,548)	(25,548)
Commercial real estate | Adjusted Balance
Assets
Total loans	5,774,811		4,890,890
Allowance			(46,083)	(46,083)
BBCC
Assets
Allowance	(6,120)			(2,279)
BBCC | Previously Reported
Assets
Total loans			352,681			352,681
Allowance			(2,279)			(2,279)
BBCC | Revision of Prior Period, Adjustment
Assets
Total loans						352,681
Allowance						(2,279)
BBCC | Adjustment
Assets
Total loans	370,423		33
Allowance			(3,702)	(3,702)
BBCC | Adjusted Balance
Assets
Total loans	370,423		352,714
Allowance			(5,981)	(5,981)
Residential real estate
Assets
Total loans	2,248,422			2,334,289
Allowance	(12,608)			(2,299)			(2,277)	(1,763)
Residential real estate | Previously Reported
Assets
Total loans			2,334,289	2,334,289		2,334,289
Allowance			(2,299)	(2,299)		(2,299)	(2,277)
Residential real estate | Revision of Prior Period, Adjustment
Assets
Total loans						0
Allowance						0
Residential real estate | Adjustment
Assets
Total loans	0		105
Allowance			(6,986)	(6,986)
Residential real estate | Adjusted Balance
Assets
Total loans	2,248,422		2,334,394
Allowance			(9,285)	(9,285)
Consumer credit, net of unearned income
Assets
Total loans	1,635,123			1,726,147
Allowance							(7,972)	$ (7,936)
Consumer credit, net of unearned income | Previously Reported
Assets
Total loans				1,726,147
Allowance				(8,147)			$ (7,972)
Consumer credit, net of unearned income | Revision of Prior Period, Adjustment
Assets
Total loans						(1,726,147)
Allowance						8,147
Consumer credit, net of unearned income | Adjustment
Assets
Total loans	(1,635,123)
Indirect
Assets
Total loans	913,902
Allowance	(3,580)			(5,319)
Indirect | Previously Reported
Assets
Total loans			935,584			935,584
Allowance			(5,319)			(5,319)
Indirect | Revision of Prior Period, Adjustment
Assets
Total loans						935,584
Allowance						(5,319)
Indirect | Adjustment
Assets
Total loans	913,902		10
Allowance			1,669	1,669
Indirect | Adjusted Balance
Assets
Total loans	913,902		935,594
Allowance			(3,650)	(3,650)
Direct
Assets
Total loans	164,807
Allowance	(855)			(1,863)
Direct | Previously Reported
Assets
Total loans			228,524			228,524
Allowance			(1,863)			(1,863)
Direct | Revision of Prior Period, Adjustment
Assets
Total loans						228,524
Allowance						(1,863)
Direct | Adjustment
Assets
Total loans	164,807		2
Allowance			1,059	1,059
Direct | Adjusted Balance
Assets
Total loans	164,807		228,526
Allowance			(804)	(804)
Home equity
Assets
Total loans	556,414
Allowance	(1,848)			(965)
Home equity | Previously Reported
Assets
Total loans			562,039			562,039
Allowance			(965)			(965)
Home equity | Revision of Prior Period, Adjustment
Assets
Total loans						562,039
Allowance						$ (965)
Home equity | Adjustment
Assets
Total loans	556,414		12
Allowance			(689)	(689)
Home equity | Adjusted Balance
Assets
Total loans	$ 556,414		562,051
Allowance			$ (1,654)	$ (1,654)
[1] Beginning January 1, 2020, calculation is based on current expected loss methodology. Prior to January 1, 2020, calculation was based on incurred loss methodology.

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