Investment Securities - Held to Maturity (Details) $ in Thousands	Jun. 30, 2020 USD ($) security	Dec. 31, 2019 USD ($) security	Jun. 30, 2019 USD ($) security
Schedule of Held-to-maturity Securities [Line Items]
Held-To-Maturity Securities, at Amortized Cost	$ 233,517	$ 245,065	$ 262,541
Gross Unrealized Gains	8,494	4,647	3,621
Gross Unrealized Losses	(136)	(94)	(94)
Held-To-Maturity Securities, at Fair Value	241,875	249,618	266,068
Maturities of Debt Securities, at Amortized Cost:
Within One Year	22,915
From 1 - 5 Years	166,350
From 5 - 10 Years	43,189
Over 10 Years	1,063
Maturities of Debt Securities, at Fair Value:
Within One Year	23,132
From 1 - 5 Years	172,403
From 5 - 10 Years	45,260
Over 10 Years	1,080
Securities in a Continuous Loss Position, at Fair Value:
Less than 12 Months	1,433	1,438	92
12 Months or Longer	1,358	1,994	16,085
Total	$ 2,791	$ 3,432	$ 16,177
Number of Securities in a Continuous Loss Position | security	8	10	37
Unrealized Losses on Securities in a Continuous Loss Position:
Less than 12 Months	$ 87	$ 85	$ 0
12 Months or Longer	49	9	94
Total	136	94	94
Equity Securities	1,583	2,063	1,850
State and Municipal Obligations
Schedule of Held-to-maturity Securities [Line Items]
Held-To-Maturity Securities, at Amortized Cost	201,592	208,243	220,529
Gross Unrealized Gains	7,056	4,170	3,206
Gross Unrealized Losses	(136)	(94)	(81)
Held-To-Maturity Securities, at Fair Value	208,512	212,319	223,654
Maturities of Debt Securities, at Amortized Cost:
Within One Year	19,115
From 1 - 5 Years	138,225
From 5 - 10 Years	43,189
Over 10 Years	1,063
Maturities of Debt Securities, at Fair Value:
Within One Year	19,199
From 1 - 5 Years	142,973
From 5 - 10 Years	45,260
Over 10 Years	1,080
Securities in a Continuous Loss Position, at Fair Value:
Less than 12 Months	1,433	1,438	159
12 Months or Longer	1,358	1,994	14,374
Total	$ 2,791	$ 3,432	$ 14,533
Number of Securities in a Continuous Loss Position | security	8	10	36
Unrealized Losses on Securities in a Continuous Loss Position:
Less than 12 Months	$ 87	$ 85	$ 0
12 Months or Longer	49	9	81
Total	136	94	81
Mortgage-Backed Securities - Residential
Schedule of Held-to-maturity Securities [Line Items]
Held-To-Maturity Securities, at Amortized Cost	31,925	36,822	42,012
Gross Unrealized Gains	1,438	477	415
Gross Unrealized Losses	0	0	(13)
Held-To-Maturity Securities, at Fair Value	33,363	37,299	42,414
Maturities of Debt Securities, at Amortized Cost:
Within One Year	3,800
From 1 - 5 Years	28,125
From 5 - 10 Years	0
Over 10 Years	0
Maturities of Debt Securities, at Fair Value:
Within One Year	3,933
From 1 - 5 Years	29,430
From 5 - 10 Years	0
Over 10 Years	0
Securities in a Continuous Loss Position, at Fair Value:
Less than 12 Months	0	0	(67)
12 Months or Longer	0	0	1,711
Total	$ 0	$ 0	$ 1,644
Number of Securities in a Continuous Loss Position | security	0	0	1
Unrealized Losses on Securities in a Continuous Loss Position:
Less than 12 Months	$ 0	$ 0	$ 0
12 Months or Longer	0	0	13
Total	0	0	13
Fair Value, Measurements, Recurring
Unrealized Losses on Securities in a Continuous Loss Position:
Equity Securities	1,583	2,063	1,850
Collateral Pledged
Schedule of Held-to-maturity Securities [Line Items]
Held-To-Maturity Securities, Pledged as Collateral, at Fair Value	227,528	237,969	251,639
US Government Agencies Debt Securities | Mortgage-Backed Securities - Residential
Schedule of Held-to-maturity Securities [Line Items]
Held-To-Maturity Securities, at Amortized Cost	11,706	1,703	1,942
US Government Agencies Debt Securities | Fair Value, Measurements, Recurring | Mortgage-Backed Securities - Residential
Schedule of Held-to-maturity Securities [Line Items]
Held-To-Maturity Securities, at Fair Value	12,131	1,720	1,948
US Government-sponsored Enterprises Debt Securities | Mortgage-Backed Securities - Residential
Schedule of Held-to-maturity Securities [Line Items]
Held-To-Maturity Securities, at Amortized Cost	20,219	35,119	40,070
US Government-sponsored Enterprises Debt Securities | Fair Value, Measurements, Recurring | Mortgage-Backed Securities - Residential
Schedule of Held-to-maturity Securities [Line Items]
Held-To-Maturity Securities, at Fair Value	$ 21,232	$ 35,579	$ 40,466