Summary of Significant Accounting Policies (Details)
$ in Thousands |
12 Months Ended |
|
Dec. 31, 2017
USD ($)
segment
|
Dec. 31, 2016
USD ($)
|
| Property, Plant and Equipment [Line Items] |
|
|
| Reserve requirements for banking subsidiaries |
$ 6,600
|
$ 6,600
|
| Investment in qualified affordable housing projects |
$ 1,400
|
2,000
|
| Number of reportable business segments | segment |
3
|
|
| Retained Earnings |
|
|
| Property, Plant and Equipment [Line Items] |
|
|
| Reclassification due to the adoption of ASU No. 2018-02 |
|
9,958
|
| Minimum | Core deposit intangible |
|
|
| Property, Plant and Equipment [Line Items] |
|
|
| Amortization period for other intangible assets (in years) |
5 years
|
|
| Minimum | Covenants Noncompete |
|
|
| Property, Plant and Equipment [Line Items] |
|
|
| Amortization period for other intangible assets (in years) |
3 years
|
|
| Minimum | Customer relationships |
|
|
| Property, Plant and Equipment [Line Items] |
|
|
| Amortization period for other intangible assets (in years) |
6 years
|
|
| Maximum | Core deposit intangible |
|
|
| Property, Plant and Equipment [Line Items] |
|
|
| Amortization period for other intangible assets (in years) |
10 years
|
|
| Maximum | Covenants Noncompete |
|
|
| Property, Plant and Equipment [Line Items] |
|
|
| Amortization period for other intangible assets (in years) |
6 years
|
|
| Maximum | Customer relationships |
|
|
| Property, Plant and Equipment [Line Items] |
|
|
| Amortization period for other intangible assets (in years) |
15 years
|
|
| Building | Minimum |
|
|
| Property, Plant and Equipment [Line Items] |
|
|
| Estimated useful (in years) |
10 years
|
|
| Building | Maximum |
|
|
| Property, Plant and Equipment [Line Items] |
|
|
| Estimated useful (in years) |
39 years
|
|
| Furniture, fixtures, and equipment | Minimum |
|
|
| Property, Plant and Equipment [Line Items] |
|
|
| Estimated useful (in years) |
2 years
|
|
| Furniture, fixtures, and equipment | Maximum |
|
|
| Property, Plant and Equipment [Line Items] |
|
|
| Estimated useful (in years) |
20 years
|
|
| Accounting Standards Update 2018-02 | Early adoption effect |
|
|
| Property, Plant and Equipment [Line Items] |
|
|
| Reclassification due to the adoption of ASU No. 2018-02 |
|
$ 10,000
|