CONSOLIDATED STATEMENTS OF CASH FLOWS - (UNAUDITED) $ in Thousands	9 Months Ended
	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)
Cash flows from operating activities
Net income	$ 12,040	$ 11,431
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation of fixed assets	1,259	986
Amortization of core deposit intangibles	576	117
Stock-based compensation expense	653	517
Provision expense for loan losses	10,334	835
Net securities premium amortization	1,526	1,277
Net gain on sales of securities	(1,862)	(151)
Originations of loans held for sale	(409,312)	(196,616)
Proceeds from sales of loans	377,238	179,350
Net gain on sales of loans	(15,373)	(5,788)
Accretion on acquired purchase credit impaired loans	(1,350)	(1,772)
Gain on sale of other real estate owned and repossessed assets	(263)	0
Increase in cash surrender value of life insurance	(353)	(214)
Amortization of debt issuance costs	115	43
Deferred income tax benefit	(3,758)	0
Net increase in accrued interest receivable and other assets	(13,433)	(14,127)
Net increase in accrued interest payable and other liabilities	2,490	4,065
Net cash used by operating activities	(39,473)	(20,047)
Cash flows from investing activities
Net increase in loans	(393,154)	(39,007)
Principal payments on securities available-for-sale	21,295	11,730
Purchases of securities available-for-sale	(83,170)	(51,373)
Purchases of other investments	(2,000)	0
Additions to premises and equipment	(665)	(1,269)
Proceeds from:
Sale of securities available-for-sale	42,640	46,545
Sale of other real estate owned and repossessed assets	2,356	0
Net cash used in acquisition	(29,464)	0
Net cash used in investing activities	(442,162)	(33,374)
Cash flows from financing activities
Net increase in deposits	543,187	59,907
Change in short-term borrowings	(65,664)	(87,584)
Issuances of FRB borrowings related to Paycheck Protection Program	34,098	0
Issuances of long-term FHLB advances	20,923	100,000
Net proceeds from issuance of preferred stock	23,370	0
Change in secured borrowing	(52)	(53)
Share buyback - redeemed stock	(620)	(2,108)
Common stock dividends paid	(1,082)	(852)
Proceeds from exercised stock options	95	219
Payments related to tax-withholding for share based compensation awards	(64)	(43)
Net cash provided by financing activities	554,191	69,486
Net change in cash and cash equivalents	72,556	16,065
Beginning cash and cash equivalents	103,930	33,296
Ending cash and cash equivalents	176,486	49,361
Supplemental disclosure of cash flow information:
Interest paid	12,117	14,109
Taxes paid	6,909	2,071
Transfer from loans held for sale to loans held for investment	2,284	1,895
Transfer from loans to other real estate owned	1,172	$ 373
Ann Arbor Bancorp, Inc
Increase in assets and liabilities in acquisitions:
Assets acquired—Ann Arbor State Bank	325,303
Liabilities assumed—Ann Arbor State Bank	$ 283,526