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Securities Securities - Amortized Cost and Fair Value of Securities (Details) - USD ($)		Dec. 31, 2018	Dec. 31, 2017
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]
Amortized cost		$ 194,282,000	$ 20,762,000
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain		152,000	114,000
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss		1,303,000	46,000
Fair Value	[1]	193,131,000	20,830,000
Debt Securities, Held-to-maturity, Maturity, Amortized Cost, Net [Abstract]
Due in one year or less		325,000
Due in one year to five years		5,710,000
Due in five to ten years		7,980,000
Due after ten years		180,267,000
Mortgage-backed securities		0
Asset-backed securities		0
Amortized cost		194,282,000	20,762,000
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]
Due in one year or less		326,000
Due in one year to five years		5,700,000
Due in five to ten years		7,935,000
Due after ten years		179,170,000
Mortgage-backed securities		0
Asset-backed securities		0
Fair Value	[1]	193,131,000	20,830,000
State And Municipal Securities
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]
Amortized cost		194,282,000	20,762,000
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain		152,000	114,000
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss		1,303,000	46,000
Fair Value		193,131,000	20,830,000
Debt Securities, Held-to-maturity, Maturity, Amortized Cost, Net [Abstract]
Amortized cost		194,282,000	20,762,000
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract]
Fair Value		$ 193,131,000	$ 20,830,000
[1] Estimated fair values are consistent with an exit-price concept. The assumptions used to estimate the fair values are intended to approximate those that a market-participant would realize in a hypothetical orderly transaction.

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