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Summary of Significant Accounting Policies (Narrative) (Details) |  |  |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2019 USD ($) | Dec. 31, 2018 USD ($) | Oct. 31, 2018 USD ($) | Jul. 31, 2018 shares | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) shares | Jun. 30, 2018 USD ($) Apartment | Mar. 31, 2018 shares | Sep. 30, 2019 USD ($) Apartment shares | Sep. 30, 2018 USD ($) shares
Residential real estate held in other real estate owned | $ 86,000,000 | $ 844,000,000 |  |  | $ 86,000,000 |  |  |  | $ 86,000,000 |
Foreclosure proceedings in process | 104,000,000 | 211,000,000 |  |  | 104,000,000 |  |  |  | 104,000,000 |
Total investment in limited partnership | 201,000 | 233,000 |  |  | 201,000 |  |  |  | $ 201,000 |
Number of apartments under the project | Apartment |  |  |  |  |  |  | 37 |  | 37 |
Limited partner capital contribution commitment | 7,579,000 |  |  |  | 7,579,000 |  | $ 7,579,000 |  | $ 7,579,000 |
Project investment amortization period |  |  |  |  |  |  | 10 years |  | 10 years |
Annual LIHTCs mount awarded for the project |  |  |  |  |  |  | $ 861,000 |  | $ 861,000 |
Total anticipated LIHTCs amount under the housing project | 8,613,000 |  |  |  | 8,613,000 |  | $ 8,613,000 |  | 8,613,000 |
Amortization expense |  |  |  |  | 355,000 | $ 341,000 |  |  | $ 1,078,000 | $ 837,000
Goodwill, Impairment Loss |  |  | $ 0 |  |  |  |  |  |  |
Dilutive securities impacting in calculation of earnings per share | shares |  |  |  |  |  |  |  |  | 0 | 0
First Priority Financial Corp. [Member] |  |  |  |  |  |  |  |  |  |
Goodwill acquired | 39,744,000 | 39,744,000 |  |  |  |  |  |  |  |
Stock issued during period, shares | shares |  |  |  | 2,320,800 |  | 2,320,800 |  |  |  |
Scottdale Bank and Trust Company [Member] |  |  |  |  |  |  |  |  |  |
Goodwill acquired | 19,178,000 | 19,178,000 |  |  |  |  |  |  |  |
Stock issued during period, shares | shares |  |  |  |  |  |  |  | 1,878,827 |  |
Phoenix Bancorp Incorporated [Member] |  |  |  |  |  |  |  |  |  |
Goodwill acquired | 3,918,000 | 3,918,000 |  |  |  |  |  |  |  |
Core Deposit Intangible [Member] |  |  |  |  |  |  |  |  |  |
Intangible assets, net | 5,860,000 | 6,893,000 |  |  | 5,860,000 |  |  |  | $ 5,860,000 |
Amortization expense |  |  |  |  | 338,000 | $ 328,000 |  |  | $ 1,033,000 | $ 816,000
Core Deposit Intangible, Amortization Period |  |  |  |  |  |  |  |  | 10 years |
Other Assets [Member] |  |  |  |  |  |  |  |  |  |
Total investment in limited partnership | 5,810,000 | 1,710,000 |  |  | 5,810,000 |  |  |  | $ 5,810,000 |
Reserve for Off-balance Sheet Activities [Member] |  |  |  |  |  |  |  |  |  |
Valuation allowances and reserves, balance | $ 134,000,000 | 159,000,000 |  |  | $ 134,000,000 |  |  |  | $ 134,000,000 |
Maximum [Member] |  |  |  |  |  |  |  |  |  |
Non-residential consumer loans charged off on contractual basis in event of bankruptcy, in period | 120 days |  |  |  | 120 days |  |  |  | 120 days |
Commercial Portfolio [Member] |  |  |  |  |  |  |  |  |  |
Loan terms |  |  |  |  |  |  |  |  | 1 year |
Loan to value ratio | 80.00% |  |  |  | 80.00% |  |  |  | 80.00% |
Residential Portfolio [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Loan terms |  |  |  |  |  |  |  |  | 30 years |
Loan to value ratio | 100.00% |  |  |  | 100.00% |  |  |  | 100.00% |
Loan to value ratio, exposure after private mortgage insurance |  |  |  |  |  |  |  |  | 85.00% |
Equity Securities [Member] |  |  |  |  |  |  |  |  |  |
Equity securities, fair value | $ 509,000 | 492,000 |  |  | $ 509,000 |  |  |  | $ 509,000 |
Equity Securities [Member] | ASU 2016-01 [Member] |  |  |  |  |  |  |  |  |  |
Equity securities, fair value | $ 509,000,000 | $ 492,000,000 |  |  | 509,000,000 |  |  |  | 509,000,000 |
Equity securities sold |  |  |  |  | $ 0 | $ 0 |  |  | $ 0 | 0
Equity Securities [Member] | ASU 2016-01 [Member] | Accumulated Other Comprehensive Loss [Member] |  |  |  |  |  |  |  |  |  |
Net unrealized losses reclassified |  |  |  |  |  |  |  |  |  | $ 44,000,000
Home equity lines of credit [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Loan terms |  |  |  |  |  |  |  |  | 20 years |
Loan to value ratio | 85.00% |  |  |  | 85.00% |  |  |  | 85.00% |
Home Equity Lines Of Credit [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Loan terms |  |  |  |  |  |  |  |  | 5 years |

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