Basis of Presentation - Schedule of Impact of ASU 2016-13 (Details) - USD ($) $ in Thousands		Mar. 31, 2020		Jan. 01, 2020	Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for credit losses on loans		$ (96,850)		$ (62,224)	$ (62,224)
Total loans		7,254,054	[1]	7,074,928	7,142,408	[1]
Net deferred tax asset				13,206
Allowance for credit losses on unfunded loan commitments		6,077		3,113	3,112
Retained earnings		740,726		761,083	761,083
As Reported Under ASU 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for credit losses on loans				(89,577)
Total loans				7,047,575
Net deferred tax asset				19,317
Allowance for credit losses on unfunded loan commitments				4,462	4,461
Retained earnings				738,493
Impact of ASU 2016-13 Adoption
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for credit losses on loans				(27,353)	(27,352)
Total loans				(27,353)
Net deferred tax asset				6,111
Allowance for credit losses on unfunded loan commitments				1,349	1,349
Retained earnings				(22,590)
Commercial and industrial | Impact of ASU 2016-13 Adoption
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Allowance for credit losses on loans				(9,900)
Commercial | Commercial real estate
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans held for investment, outstanding balance				3,416,518
Allowance for credit losses on loans		(42,611)			(30,577)
Commercial | Commercial real estate | As Reported Under ASU 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans held for investment, outstanding balance				2,946,319
Commercial | Commercial real estate | Impact of ASU 2016-13 Adoption
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans held for investment, outstanding balance				(470,199)
Allowance for credit losses on loans					(4,810)
Commercial | Commercial and industrial
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans held for investment, outstanding balance				1,720,833
Allowance for credit losses on loans		(19,870)			(15,681)
Commercial | Commercial and industrial | As Reported Under ASU 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans held for investment, outstanding balance				1,458,541
Commercial | Commercial and industrial | Impact of ASU 2016-13 Adoption
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans held for investment, outstanding balance				(262,292)
Allowance for credit losses on loans					(7,853)
Commercial | Commercial construction
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans held for investment, outstanding balance				375,445
Allowance for credit losses on loans		(6,606)			(7,900)
Commercial | Commercial construction | As Reported Under ASU 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans held for investment, outstanding balance				345,263
Commercial | Commercial construction | Impact of ASU 2016-13 Adoption
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans held for investment, outstanding balance				(30,182)
Allowance for credit losses on loans					3,376
Commercial | Business banking
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans held for investment, outstanding balance				0
Allowance for credit losses on loans	[2]	(13,706)			0
Commercial | Business banking | As Reported Under ASU 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans held for investment, outstanding balance				1,092,908
Commercial | Business banking | Impact of ASU 2016-13 Adoption
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans held for investment, outstanding balance				1,092,908
Allowance for credit losses on loans	[2]				(12,898)
Consumer | Consumer real estate
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans held for investment, outstanding balance				1,545,323
Allowance for credit losses on loans		(11,200)			(6,337)
Consumer | Consumer real estate | As Reported Under ASU 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans held for investment, outstanding balance				1,235,352
Consumer | Consumer real estate | Impact of ASU 2016-13 Adoption
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans held for investment, outstanding balance				(309,971)
Allowance for credit losses on loans					(4,525)
Consumer | Other consumer
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans held for investment, outstanding balance				79,033
Allowance for credit losses on loans		$ (2,857)			(1,729)
Consumer | Other consumer | As Reported Under ASU 2016-13
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans held for investment, outstanding balance				58,769
Consumer | Other consumer | Impact of ASU 2016-13 Adoption
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans held for investment, outstanding balance				$ (20,264)
Allowance for credit losses on loans					$ (642)

[1] Excludes interest receivable of $22.1 million at both March 31, 2020 and December 31, 2019. Interest receivable is included in other assets in the consolidated balance sheets.

[2] In connection with our adoption of ASU 2016-13, we made changes to our loan portfolio segments to align with the methodology applied in determining the allowance under CECL. Our new segmentation breaks out business banking loans from our other loan segments: CRE, C&I , commercial construction, consumer real estate and other consumer. The business banking allowance balance at the beginning of period is included in the other segments and reclassified to business banking through the impact of CECL adoption line.