Employee Benefit Plans (Narrative) (Details) - USD ($)	3 Months Ended		12 Months Ended
	Sep. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Employee Stock Ownership Plan (ESOP), cash contributions to ESOP			$ 200,000	$ 200,000
Employee Stock Ownership Plan (ESOP), number of allocated shares (in shares)			156,447	156,707
Employee Stock Ownership Plan (ESOP), number of unallocated shares (in shares)			13,175	17,325
Employee Stock Ownership Plan (ESOP), allocated shares market value			$ 300,000	$ 600,000
Employee Stock Ownership Plan (ESOP), allocated excess of fair market value of leveraged ESOP shares released			$ (39,000)	$ (3,000)
Employee Stock Ownership Plan
Defined Benefit Plan Disclosure [Line Items]
Employee benefit plan requisite service period			1 year
Award vesting period			3 years
Share Price (in dollars per share)			$ 26.48	$ 35.57
Promissory notes			$ 500,000	$ 600,000
Employee Stock Ownership Plan (ESOP) promissory note amortization period			7 years
Employee Stock Ownership Plan (ESOP), Employer cash payments used for debt service			$ 100,000	$ 200,000
Employee Stock Ownership Plan (ESOP), debt structure direct loan employer shares used for debt service (in shares)			4,150	4,815
Employee Stock Ownership Plan (ESOP), debt structure offset by purchase of common shares (in shares)			0	3,271
Employee Stock Ownership Plan (ESOP), debt structure offset by purchase of common shares, amount	$ 63,000	$ 39,000
Prime Rate | Employee Stock Ownership Plan
Defined Benefit Plan Disclosure [Line Items]
Employee Stock Ownership Plan (ESOP) basis spread on variable rate			1.00%
401 (K) Plan
Defined Benefit Plan Disclosure [Line Items]
Maximum employee contribution employer will match			8.00%	8.00%	8.00%
Minimim period of service			6 months
Period of service eligible for vesting			3 years
Retirement plan expense			$ 500,000	$ 500,000
Nonqualified Retirement Plan For Non Employee Directors
Defined Benefit Plan Disclosure [Line Items]
Employee benefit plan requisite service period			15 years
Award vesting period			2 years
Contributions by employer			$ 41,000
Retirement plan expense			20,000	26,000
Liability			2,100,000	2,200,000
Maximum annual benefit following retirement (per employee)			$ 3,500
Number of years following retirement benefit is paid			10 years
Individual Supplemental Retirement Plans
Defined Benefit Plan Disclosure [Line Items]
Retirement plan expense			$ 800,000	$ 900,000
Number of years following retirement benefit is paid			15 years
Maximum | Nonqualified Retirement Plan For Non Employee Directors
Defined Benefit Plan Disclosure [Line Items]
Period for distribution of deferred amount			10 years
Minimum | Nonqualified Retirement Plan For Non Employee Directors
Defined Benefit Plan Disclosure [Line Items]
Period for distribution of deferred amount			1 year