Fair Value of Financial Instruments Recurring basis (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Investments
Total available-for-sale securities	$ 936,101	$ 791,891
US Government-sponsored Enterprises Debt Securities
Investments
Total available-for-sale securities	8,209
States and political subdivisions
Investments
Total available-for-sale securities	114,104	88,587
Residential mortgage-backed securities
Investments
Total available-for-sale securities	791,009	692,608
Commercial mortgage-backed securities
Investments
Total available-for-sale securities	18,088	6,707
Bank-issued trust preferred securities
Investments
Total available-for-sale securities	4,691	3,989
Equity investment securities (a)
Investments
Other investment securities	321	277
Level 1 \| Recurring Basis
Investments
Total available-for-sale securities	0	0
Level 1 \| States and political subdivisions \| Recurring Basis
Investments
Total available-for-sale securities	0	0
Level 1 \| Residential mortgage-backed securities \| Recurring Basis
Investments
Total available-for-sale securities	0	0
Level 1 \| Commercial mortgage-backed securities \| Recurring Basis
Investments
Total available-for-sale securities	0	0
Level 1 \| Bank-issued trust preferred securities \| Recurring Basis
Investments
Total available-for-sale securities	0	0
Level 1 \| Equity investment securities (a) \| Recurring Basis
Investments
Total available-for-sale securities	0
Other investment securities	123	94
Level 2
Investments
Other investment securities	42,409	42,708
Level 2 \| Recurring Basis
Investments
Total available-for-sale securities	936,101	791,891
Derivative assets (b)	11,419	4,544
Derivative liabilities (c)	15,116	3,562
Level 2 \| US Government-sponsored Enterprises Debt Securities \| Recurring Basis
Investments
Total available-for-sale securities	8,209
Level 2 \| States and political subdivisions \| Recurring Basis
Investments
Total available-for-sale securities	114,104	88,587
Level 2 \| Residential mortgage-backed securities \| Recurring Basis
Investments
Total available-for-sale securities	791,009	692,608
Level 2 \| Commercial mortgage-backed securities \| Recurring Basis
Investments
Total available-for-sale securities	18,088	6,707
Level 2 \| Bank-issued trust preferred securities \| Recurring Basis
Investments
Total available-for-sale securities	4,691	3,989
Level 2 \| Equity investment securities (a) \| Recurring Basis
Investments
Other investment securities	198	183
Level 3 \| Recurring Basis
Investments
Total available-for-sale securities	0	0
Level 3 \| States and political subdivisions \| Recurring Basis
Investments
Total available-for-sale securities	0	0
Level 3 \| Residential mortgage-backed securities \| Recurring Basis
Investments
Total available-for-sale securities	0	0
Level 3 \| Commercial mortgage-backed securities \| Recurring Basis
Investments
Total available-for-sale securities	0	0
Level 3 \| Bank-issued trust preferred securities \| Recurring Basis
Investments
Total available-for-sale securities	$ 0	0
Level 3 \| Equity investment securities (a) \| Recurring Basis
Investments
Total available-for-sale securities		$ 0

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Amount of investments classified as other.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
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