Investment Securities - Held-to-Maturity and Available-for-Sale, Scheduled Maturities (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]
Securities Held-to-Maturity, Amortized Cost	$ 172,946	$ 142,634
Securities Held-to-Maturity, Gross Unrealized Gains	2,410	287
Securities Held-to-Maturity, Gross Unrealized Losses	(60)	(1,346)
Securities Held-to-Maturity, Fair Value	175,296	141,575
Debt Securities, Available-for-sale [Abstract]
Securities Available-for-Sale, Debt Securities, Fair Value	293,022	328,507
Debt Securities, Available-For-Sale And Held-To-Maturity, Amortized Cost	299,181	342,711
Securities Available-for-Sale, Gross Unrealized Gain	1,070	394
Securities Available-for-Sale, Gross Unrealized Loss	(7,229)	(14,598)
Securities Available-for-Sale, Fair Value	293,022	328,507
U.S. Government Corporations and Agencies [Member]
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]
Securities Held-to-Maturity, Amortized Cost, After 1 year to 5 years	6,997	6,996
Securities Held-to-Maturity, Gross Unrealized Gains, After 1 year to 5 years	55	0
Securities Held-to-Maturity, Gross Unrealized Losses, After 1 year to 5 years	0	(104)
Securities Held-to-Maturity, Fair Value, After 1 year to 5 years	7,052	6,892
Securities Held-to-Maturity, Amortized Cost	6,997	6,996
Securities Held-to-Maturity, Gross Unrealized Gains	55	0
Securities Held-to-Maturity, Gross Unrealized Losses	0	(104)
Securities Held-to-Maturity, Fair Value	7,052	6,892
Debt Securities, Available-for-sale [Abstract]
Securities Available-for-Sale, Amortized Cost, Within 1 year	10,332	15,108
Securities Available-for-Sale, Gross Unrealized Gains, Within 1 year	0	0
Securities Available-for-Sale, Gross Unrealized Losses, Within 1 year	(16)	(90)
Securities Available-for-Sale, Fair Value, Within 1 year	10,316	15,018
Securities Available-for-Sale, Amortized Cost, After 1 year to 5 years	0	303
Securities Available-for-Sale, Gross Unrealized Gains, After 1 year to 5 years	0	0
Securities Available-for-Sale, Gross Unrealized Losses, After 1 year to 5 years	0	(6)
Securities Available-for-Sale, Fair Value, After 1 year to 5 years	0	297
Securities Available-for-Sale, Amortized Cost	10,332	15,411
Securities Available-for-Sale, Debt Securities, Gross Unrealized Gain	0	0
Securities Available-for-Sale, Debt Securities, Gross Unrealized Losses	(16)	(96)
Securities Available-for-Sale, Debt Securities, Fair Value	10,316	15,315
State and Political Subdivisions [Member]
Debt Securities, Available-for-sale [Abstract]
Securities Available-for-Sale, Amortized Cost, Within 1 year	1,395	5,900
Securities Available-for-Sale, Gross Unrealized Gains, Within 1 year	3	4
Securities Available-for-Sale, Gross Unrealized Losses, Within 1 year	0	(6)
Securities Available-for-Sale, Fair Value, Within 1 year	1,398	5,898
Securities Available-for-Sale, Amortized Cost, After 1 year to 5 years	5,732	15,459
Securities Available-for-Sale, Gross Unrealized Gains, After 1 year to 5 years	63	36
Securities Available-for-Sale, Gross Unrealized Losses, After 1 year to 5 years	0	(56)
Securities Available-for-Sale, Fair Value, After 1 year to 5 years	5,795	15,439
Securities Available-for-Sale, Amortized Cost, After 5 years to 10 years	36,550	43,923
Securities Available-for-Sale, Gross Unrealized Gains, After 5 years to 10 years	429	318
Securities Available-for-Sale, Gross Unrealized Losses, After 5 years to 10 years	0	(163)
Securities Available-for-Sale, Fair Value, After 5 years to 10 years	36,979	44,078
Securities Available-for-Sale, Amortized Cost	43,677	65,282
Securities Available-for-Sale, Debt Securities, Gross Unrealized Gain	495	358
Securities Available-for-Sale, Debt Securities, Gross Unrealized Losses	0	(225)
Securities Available-for-Sale, Debt Securities, Fair Value	44,172	65,415
Residential Mortgage Backed Securities [Member]
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]
Securities Held-to-Maturity, Amortized Cost, After 5 years to 10 years	10,379	11,573
Securities Held-to-Maturity, Gross Unrealized Gains, After 5 years to 10 years	102	0
Securities Held-to-Maturity, Gross Unrecognized Losses, After 5 years to 10 years	0	(135)
Securities Held-to-Maturity, Fair Value, After 5 years to 10 years	10,481	11,438
Securities Held-to-Maturity, Amortized Cost, Over 10 years	155,570	124,065
Securities Held-to-Maturity, Gross Unrealized Gain, Over 10 years	2,253	287
Securities Held-to-Maturity, Gross Unrealized Losses, Over 10 years	(60)	(1,107)
Securities Held-to-Maturity, Fair Value, After 10 Years	157,763	123,245
Securities Held-to-Maturity, Amortized Cost	165,949	135,638
Securities Held-to-Maturity, Gross Unrealized Gains	2,355	287
Securities Held-to-Maturity, Gross Unrealized Losses	(60)	(1,242)
Securities Held-to-Maturity, Fair Value	168,244	134,683
Debt Securities, Available-for-sale [Abstract]
Securities Available-for-Sale, Amortized Cost, After 1 year to 5 years	5,420	5,799
Securities Available-for-Sale, Gross Unrealized Gains, After 1 year to 5 years	20	3
Securities Available-for-Sale, Gross Unrealized Losses, After 1 year to 5 years	(5)	(70)
Securities Available-for-Sale, Fair Value, After 1 year to 5 years	5,435	5,732
Securities Available-for-Sale, Amortized Cost, After 5 years to 10 years	43,799	49,904
Securities Available-for-Sale, Gross Unrealized Gains, After 5 years to 10 years	52	6
Securities Available-for-Sale, Gross Unrealized Losses, After 5 years to 10 years	(237)	(1,381)
Securities Available-for-Sale, Fair Value, After 5 years to 10 years	43,614	48,529
Securities Available-for-Sale, Amortized Cost, Over 10 years	93,324	100,873
Securities Available-for-Sale, Gross Unrealized Gains, Over 10 years	172	26
Securities Available-for-Sale, Gross Unrealized Losses, Over 10 years	(730)	(3,398)
Securities Available-for-Sale, Fair Value, Over 10 years	92,766	97,501
Securities Available-for-Sale, Amortized Cost	142,543	156,576
Securities Available-for-Sale, Debt Securities, Gross Unrealized Gain	244	35
Securities Available-for-Sale, Debt Securities, Gross Unrealized Losses	(972)	(4,849)
Securities Available-for-Sale, Debt Securities, Fair Value	141,815	151,762
Collateralized Mortgage Obligations [Member]
Debt Securities, Available-for-sale [Abstract]
Securities Available-for-Sale, Amortized Cost, After 5 years to 10 years	1,497	1,677
Securities Available-for-Sale, Gross Unrealized Gains, After 5 years to 10 years	0	0
Securities Available-for-Sale, Gross Unrealized Losses, After 5 years to 10 years	(31)	(78)
Securities Available-for-Sale, Fair Value, After 5 years to 10 years	1,466	1,599
Securities Available-for-Sale, Amortized Cost, Over 10 years	1,200	1,305
Securities Available-for-Sale, Gross Unrealized Gains, Over 10 years	11	0
Securities Available-for-Sale, Gross Unrealized Losses, Over 10 years	0	(16)
Securities Available-for-Sale, Fair Value, Over 10 years	1,211	1,289
Securities Available-for-Sale, Amortized Cost	2,697	2,982
Securities Available-for-Sale, Debt Securities, Gross Unrealized Gain	11	0
Securities Available-for-Sale, Debt Securities, Gross Unrealized Losses	(31)	(94)
Securities Available-for-Sale, Debt Securities, Fair Value	2,677	2,888
Corporate Bonds [Member]
Debt Securities, Available-for-sale [Abstract]
Securities Available-for-Sale, Amortized Cost, Within 1 year	10,817	7,806
Securities Available-for-Sale, Gross Unrealized Gains, Within 1 year	0	0
Securities Available-for-Sale, Gross Unrealized Losses, Within 1 year	(33)	(68)
Securities Available-for-Sale, Fair Value, Within 1 year	10,784	7,738
Securities Available-for-Sale, Amortized Cost, After 1 year to 5 years	29,115	18,508
Securities Available-for-Sale, Gross Unrealized Gains, After 1 year to 5 years	320	1
Securities Available-for-Sale, Gross Unrealized Losses, After 1 year to 5 years	(27)	(332)
Securities Available-for-Sale, Fair Value, After 1 year to 5 years	29,408	18,177
Securities Available-for-Sale, Amortized Cost, After 5 years to 10 years	0	16,146
Securities Available-for-Sale, Gross Unrealized Gains, After 5 years to 10 years	0	0
Securities Available-for-Sale, Gross Unrealized Losses, After 5 years to 10 years		(392)
Securities Available-for-Sale, Fair Value, After 5 years to 10 years	0	15,754
Securities Available-for-Sale, Amortized Cost, Over 10 years	60,000	60,000
Securities Available-for-Sale, Gross Unrealized Gains, Over 10 years	0	0
Securities Available-for-Sale, Gross Unrealized Losses, Over 10 years	(6,150)	(8,542)
Securities Available-for-Sale, Fair Value, Over 10 years	53,850	51,458
Securities Available-for-Sale, Amortized Cost	99,932	102,460
Securities Available-for-Sale, Debt Securities, Gross Unrealized Gain	320	1
Securities Available-for-Sale, Debt Securities, Gross Unrealized Losses	(6,210)	(9,334)
Securities Available-for-Sale, Debt Securities, Fair Value	$ 94,042	$ 93,127