Basis of Presentation and Summary of Significant Accounting Policies Significant Accounting Policies Text (Details)	12 Months Ended
	Dec. 31, 2018 USD ($) affiliate segment plan market	Dec. 31, 2017 USD ($) segment	Dec. 31, 2016 USD ($)	Jan. 01, 2018 USD ($)		Jan. 01, 2017 USD ($)	[2]
Accounting Policies [Line Items]
Number of reportable segments | segment	3	4
Cash reserve	$ 4,300,000	$ 3,600,000
Other than temporary impairment investments	$ 0	0	$ 0
Number of stock-based compensation plans | plan	3
Effective tax rate reconciliation, share based compensation	$ 700,000	300,000
Salaries and employee benefits	161,468,000	178,501,000	164,683,000
Other expense	$ 14,161,000	14,474,000	12,521,000
Leasehold improvements
Accounting Policies [Line Items]
Property plant and equipment useful life	10 years
Buildings
Accounting Policies [Line Items]
Property plant and equipment useful life	40 years
Furniture and Fixtures
Accounting Policies [Line Items]
Property plant and equipment useful life	6 years
Office Equipment
Accounting Policies [Line Items]
Property plant and equipment useful life	5 years
Computer Equipment
Accounting Policies [Line Items]
Property plant and equipment useful life	3 years
Minimum
Accounting Policies [Line Items]
Finite-lived intangible asset useful life	8 years
Maximum
Accounting Policies [Line Items]
Finite-lived intangible asset useful life	15 years
Private Banking
Accounting Policies [Line Items]
Number of geographic markets | market	3
Affiliate Partners (4)
Accounting Policies [Line Items]
Number of consolidated entities | affiliate	4
Accumulated Other Comprehensive Income/ (Loss)
Accounting Policies [Line Items]
Reclassification due to change in accounting principle				$ (334,000)	[1]	$ (1,535,000)
Retained Earnings
Accounting Policies [Line Items]
Reclassification due to change in accounting principle				334,000	[1]	$ 1,535,000
Accounting Standards Update 2016-01 | Accumulated Other Comprehensive Income/ (Loss)
Accounting Policies [Line Items]
Reclassification due to change in accounting principle				(339,000)
Accounting Standards Update 2016-01 | Retained Earnings
Accounting Policies [Line Items]
Reclassification due to change in accounting principle				339,000
Accounting Standards Update 2017-07
Accounting Policies [Line Items]
Other expense	$ 423,000
Accounting Standards Update 2017-12 | Accumulated Other Comprehensive Income/ (Loss)
Accounting Policies [Line Items]
Reclassification due to change in accounting principle				5,000
Accounting Standards Update 2017-12 | Retained Earnings
Accounting Policies [Line Items]
Reclassification due to change in accounting principle				$ (5,000)
Accounting Standards Update 2018-02 | Accumulated Other Comprehensive Income/ (Loss)
Accounting Policies [Line Items]
Reclassification due to change in accounting principle		(1,500,000)
Accounting Standards Update 2018-02 | Retained Earnings
Accounting Policies [Line Items]
Reclassification due to change in accounting principle		1,500,000
Restatement Adjustment | Accounting Standards Update 2017-07
Accounting Policies [Line Items]
Salaries and employee benefits		(95,000)	(916,000)
Other expense		$ 95,000	$ 916,000
Residential
Accounting Policies [Line Items]
Amount eligible for purchase by FNMA, general limit	453,000
Amount eligible for purchase by FNMA, high cost limit	$ 680,000

[1] Reclassification due to the adoption of ASU 2016-01 and ASU 2017-12. See Part II. Item 8. “Financial Statements and Supplementary Data - Note 1: Basis of Presentation and Summary of Significant Accounting Policies.”

[2] Reclassification due to the adoption of ASU 2018-02. See Part II. Item 8. “Financial Statements and Supplementary Data - Note 1: Basis of Presentation and Summary of Significant Accounting Policies.”