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Long-term Debt (Narrative) (Details)	3 Months Ended
	Mar. 31, 2019 Facility	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Debt Instrument [Line Items]
Long-term debt outstanding		$ 32,903,000	$ 48,024,000
Number of lease agreement under non-cancelable finance lease | Facility	1
FHLB prepayment		20,000,000
FHLB prepayment penalty		93,000	0	$ 0
FHLB fixed rate instruments, aggregate principal amounts due, 2019		27,746,000
FHLB fixed rate instruments, aggregate principal amounts due, 2020		258,000
FHLB fixed rate instruments, aggregate principal amounts due, 2021		271,000
FHLB fixed rate instruments, aggregate principal amounts due, 2022		284,000
FHLB fixed rate instruments, aggregate principal amounts due, 2023		299,000
FHLB fixed rate instruments, aggregate principal amounts due, thereafter		535,000
FHLB [Member]
Debt Instrument [Line Items]
Letter of credit outstanding, amount		$ 169,051,000	$ 36,850,000

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Federal home loan bank advances penalty.

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Federal home loan bank advances prepayment

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Number of lease agreement under non cancelable finance lease.

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Including both current and noncurrent portions, Federal Home Loan Bank borrowings initially due beyond one year or beyond the normal operating cycle if longer.

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Amount of advances from Federal Home Loan Bank (FHLBank) maturing after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of advances from Federal Home Loan Bank (FHLBank) maturing in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of advances from Federal Home Loan Bank (FHLBank) maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of advances from Federal Home Loan Bank (FHLBank) maturing in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of advances from Federal Home Loan Bank (FHLBank) maturing in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of advances from Federal Home Loan Bank (FHLBank) maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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