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Summary of Significant Accounting Policies (Narrative) (Details) |  | 1 Months Ended | 3 Months Ended | 12 Months Ended | 15 Months Ended
--- | --- | --- | --- | --- | ---
Mar. 31, 2021 USD ($) | Mar. 31, 2020 USD ($) | Mar. 31, 2021 USD ($) Apartment shares | Mar. 31, 2020 USD ($) shares | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Mar. 31, 2021 USD ($)
Loans and leases receivable, net, carrying amount | $ 2,632,645,000 |  | $ 2,632,645,000 |  |  | $ 2,370,659,000 | $ 2,632,645,000
Loans and leases, net of unearned interest | 251,644,000 |  | 251,644,000 |  |  | 276,701,000 | 251,644,000
Bank premises and equipment held for sale | 210,000 |  | $ 210,000 |  |  | 210,000 | 210,000
Asset held for sale, description |  |  | Bank premises and equipment designated as held for sale are carried at the lower of cost or market value, and, at March 31, 2021 and December 31, 2020, consisted of a retail banking property which was closed and listed for sale on December 31, 2020 totaling $210,000 and in included in other assets on the Consolidated Balance Sheets. |  |  |  |
Residential real estate held in other real estate owned | 144,000 |  | $ 144,000 |  |  | 134,000 | 144,000
Foreclosure proceedings in process | 87,000 |  | 87,000 |  |  | 13,000 | 87,000
Carrying value of investment in limited partnership | 135,000 |  | $ 135,000 |  |  | 146,000 | 135,000
Number of apartments under the project | Apartment |  |  | 37 |  |  |  |
Limited partner capital contribution | 7,506,000 |  | $ 7,506,000 |  |  |  | 7,506,000
Limited partner capital contribution, funded period |  |  | 3 years |  |  |  |
Project investment amortization period |  |  | 10 years |  |  |  |
Amortization expense |  |  | $ 281,000 | $ 323,000 |  |  |
Goodwill | 62,840,000 |  | 62,840,000 |  |  | 62,840,000 | 62,840,000
Goodwill, Impairment Loss |  | $ 0 | $ 0 |  |  |  |
Number of antidilutive shares | shares |  |  | 0 | 0 |  |  |
First Priority Financial Corp. [Member] |  |  |  |  |  |  |
Goodwill acquired |  |  | $ 39,744,000 |  |  | 39,744,000 |
Scottdale Bank and Trust Company [Member] |  |  |  |  |  |  |
Goodwill acquired |  |  | 19,178,000 |  |  | 19,178,000 |
Phoenix Bancorp Incorporated [Member] |  |  |  |  |  |  |
Goodwill acquired |  |  | 3,918,000 |  |  | 3,918,000 |
Core Deposit Intangible [Member] |  |  |  |  |  |  |
Intangible assets, net | 4,039,000 |  | 4,039,000 |  |  | 4,311,000 | 4,039,000
Amortization expense |  |  | $ 272,000 | $ 310,000 |  |  |
Core Deposit Intangible, Amortization Period |  |  | 10 years |  |  |  |
Impairment of core deposit intangible |  |  | $ 0 |  |  |  |
Intangible assets, growth recognized |  |  | $ 192,247,000 |  |  | $ 562,186,000 |
Finite Lived Intangible Assets Growth Percentage |  |  | 8.00% |  |  | 29.00% |
Scenario Forecast [Member] |  |  |  |  |  |  |
Total LIHTCs amount awarded for the project |  |  |  |  | $ 8,530,000 |  |
Annual LIHTCs amount under the housing project |  |  |  |  | $ 853,000 |  |
Project investment recognition period |  |  |  |  | 10 years |  |
Other Assets [Member] |  |  |  |  |  |  |
Carrying value of investment in limited partnership | 6,527,000 |  | $ 6,527,000 |  |  | $ 6,682,000 | 6,527,000
Non Interest Expense [Member] |  |  |  |  |  |  |
Asset held for sale, impairment charge |  |  | 0 | 0 |  |  |
Reserve for Off-balance Sheet Activities [Member] |  |  |  |  |  |  |
Valuation allowances and reserves, balance | $ 66,000 |  | $ 66,000 |  |  | 66,000 | $ 66,000
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% |  |  |  |
Small Business Administration [Member] | PPP Loans [Member] |  |  |  |  |  |  |
Loans and leases receivable, net, carrying amount | $ 590,035,000 |  | $ 590,035,000 |  |  | 388,313,000 | $ 590,035,000
Loans and leases receivable, disbursed amount |  |  | $ 335,589,000 |  |  | 254,446,000 |
Loan guarantee description |  |  | The PPP loans, which are 100 percent guaranteed by the SBA, have up to a five-year term to maturity and carry a low interest rate of 1 percent throughout the loan term. |  |  |  |
Nonrefundable loan processing fees received | 15,882,000 |  | $ 15,882,000 |  |  | 20,883,000 | 36,765,000
Deferred loan processing fees | 18,581,000 |  | 18,581,000 |  |  | 7,746,000 | 18,581,000
Proceeds from deferred loan processing fees |  |  | 14,988,000 |  |  | 3,593,000 |
Loan processing fees |  |  | 5,047,000 | 0 |  |  |
Loss reserve |  |  | $ 0 |  |  | 0 |
Small Business Administration [Member] | Maximum [Member] | PPP Loans [Member] |  |  |  |  |  |  |
Processing fee percentage |  |  | 5.00% |  |  |  |
Small Business Administration [Member] | Minimum [Member] | PPP Loans [Member] |  |  |  |  |  |  |
Processing fee percentage |  |  | 1.00% |  |  |  |
Equity Securities [Member] |  |  |  |  |  |  |
Equity securities, fair value | 508,000 |  | $ 508,000 |  |  | 515,000 | 508,000
Equity Securities [Member] | ASU 2016-01 [Member] |  |  |  |  |  |  |
Equity securities, fair value | $ 508,000 |  | 508,000 |  |  | $ 515,000 | $ 508,000
Equity securities sold |  |  | $ 0 | $ 0 |  |  |
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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