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Investment Securities - Summary of Amortized Cost and Estimated Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 323,809
Unrealized Gains	578
Unrealized Losses	(6,971)
Fair Value (Estimated)	317,416
Securities available-for-sale, Amortized Cost		$ 300,872
Securities available-for-sale, Unrealized Gains		859
Securities available-for-sale, Unrealized Losses		(4,532)
Securities available-for-sale, Fair Value (Estimated)		297,199
Securities to be held to maturity, cost and FMV [Abstract]
Amortized Cost	255,663	256,567
Unrealized Gains	1,382	4,499
Unrealized Losses	(6,145)	(1,411)
Fair Value (Estimated)	250,900	259,655
Restricted equity securities
Federal Home Loan Bank Stock	10,549	9,321
Federal Reserve Bank Stock	1,037	1,037
Restricted equity securities	11,586	10,358
State and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	4,955
Unrealized Gains	0
Unrealized Losses	(239)
Fair Value (Estimated)	4,716
Securities available-for-sale, Amortized Cost		6,860
Securities available-for-sale, Unrealized Gains		16
Securities available-for-sale, Unrealized Losses		(107)
Securities available-for-sale, Fair Value (Estimated)		6,769
Securities to be held to maturity, cost and FMV [Abstract]
Amortized Cost	221,958	217,828
Unrealized Gains	1,046	3,931
Unrealized Losses	(5,418)	(1,103)
Fair Value (Estimated)	217,586	220,656
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	313,854
Unrealized Gains	571
Unrealized Losses	(6,732)
Fair Value (Estimated)	307,693
Securities available-for-sale, Amortized Cost		293,689
Securities available-for-sale, Unrealized Gains		722
Securities available-for-sale, Unrealized Losses		(4,422)
Securities available-for-sale, Fair Value (Estimated)		289,989
Securities to be held to maturity, cost and FMV [Abstract]
Amortized Cost	18,250	23,284
Unrealized Gains	336	568
Unrealized Losses	(255)	(128)
Fair Value (Estimated)	18,331	23,724
U.S. Government-sponsored agencies
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	5,000
Unrealized Gains	7
Unrealized Losses	0
Fair Value (Estimated)	5,007
Securities to be held to maturity, cost and FMV [Abstract]
Amortized Cost	11,155	11,155
Unrealized Gains	0	0
Unrealized Losses	(472)	(180)
Fair Value (Estimated)	10,683	10,975
Corporate securities
Securities to be held to maturity, cost and FMV [Abstract]
Amortized Cost	4,300	4,300
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value (Estimated)	$ 4,300	4,300
Other equity securities
Debt Securities, Available-for-sale [Line Items]
Securities available-for-sale, Amortized Cost		323
Securities available-for-sale, Unrealized Gains		121
Securities available-for-sale, Unrealized Losses		(3)
Securities available-for-sale, Fair Value (Estimated)		$ 441

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