Business Combinations (Purchased Loans) (Details) - Ann Arbor Bancorp, Inc $ in Thousands	Jan. 02, 2020 USD ($)
Accounted for under ASC 310-30:
Contractual cash flows	$ 1,018
Contractual cash flows not expected to be collected (nonaccretable difference)	82
Expected cash flows	936
Interest component of expected cash flows (accretable yield)	35
Fair value at acquisition	901
Accounted for under ASC 310-20:
Unpaid principal and interest balance	221,061
Fair value premium	394
Fair value at acquisition	221,455
Total fair value at acquisition	$ 222,356

Business Combination, Acquired Receivable, Fair Value Premium (Discount)

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Business Combination, Recognized Identifiable Assets Acquired And Liabilities Assumed, Loans Held For Investment

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Certain Loans Acquired In Transfer Not Accounted For As Debt Securities, Acquired During Period, Accretable Yield

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Fair value of acquired receivable from business combination, excluding certain loans and debt securities acquired in transfer.

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-Publisher FASB
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For receivables acquired in a business combination, excluding certain loans and debt securities acquired in a transfer (as defined), this element represents the gross contractual amounts receivable, by major class of receivable, such as loans, direct finance leases (as defined), and any other class of receivables.

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Fair value at acquisition of acquired loans not accounted for as debt securities with evidence of deterioration of credit quality.

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Amount of cash flows expected to be collected at acquisition of acquired loans not accounted for as debt securities with evidence of deterioration of credit quality.

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Amount of contractually required payments receivable at acquisition of acquired loans not accounted for as debt securities with evidence of deterioration of credit quality.

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Reserve for loans impairments recorded after acquisition as a result of current information and events which result in it being probable that estimated cash flows will be less than previously expected or because actual cash flows are less than cash flows previously expected. This relates to loans not accounted for as debt securities, with evidence of deterioration of credit quality since origination that was acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable.

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