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Note 2 - Securities - Summary of Amortized Costs and Fair Values of Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | --- | ---
Amortized cost, available for sale securities | $ 290,058 |  | $ 136,355
Gross unrealized gains, available for sale securities | 2,033 |  | 3,952
Gross unrealized losses, available for sale securities | (2,596) |  | (82)
Fair value, available for sale securities | 289,495 | $ 289,495 | 140,225
Securities held to maturity, at amortized cost (fair value, 2021, $33,617; 2020, $14,743) | 33,441 |  | 14,234
Gross unrealized gains, held to maturity securities | 242 |  | 509
Gross unrealized losses, held to maturity securities | (66) |  | 0
Securities, fair value | 33,617 | 33,617 | 14,743
Amortized cost, held to maturity securities | 33,441 |  | 14,234
Fair value, held to maturity securities | 33,617 | 33,617 | 14,743
Amortized cost | 323,499 |  | 150,589
Gross unrealized gains | 2,275 |  | 4,461
Gross unrealized losses | (2,662) |  | (82)
Total securities, fair value |  | 323,112 | 154,968
US Treasury Securities [Member] |  |  |
Amortized cost, available for sale securities | 39,871 |  |
Gross unrealized gains, available for sale securities | 37 |  |
Gross unrealized losses, available for sale securities | (250) |  |
Fair value, available for sale securities |  | 39,658 |
US Agency and Mortgage-backed Securities [Member] |  |  |
Amortized cost, available for sale securities | 177,131 |  | 98,848
Gross unrealized gains, available for sale securities | 1,085 |  | 2,830
Gross unrealized losses, available for sale securities | (1,837) |  | (80)
Fair value, available for sale securities |  | 176,379 | 101,598
Securities held to maturity, at amortized cost (fair value, 2021, $33,617; 2020, $14,743) | 26,392 |  | 9,588
Gross unrealized gains, held to maturity securities | 124 |  | 264
Gross unrealized losses, held to maturity securities | (53) |  | 0
Securities, fair value |  | 26,463 | 9,852
Amortized cost, held to maturity securities | 26,392 |  | 9,588
Fair value, held to maturity securities |  | 26,463 | 9,852
US States and Political Subdivisions Debt Securities [Member] |  |  |
Amortized cost, available for sale securities | 71,037 |  | 37,507
Gross unrealized gains, available for sale securities | 910 |  | 1,122
Gross unrealized losses, available for sale securities | (509) |  | (2)
Fair value, available for sale securities |  | 71,438 | 38,627
Securities held to maturity, at amortized cost (fair value, 2021, $33,617; 2020, $14,743) | 7,049 |  | 3,146
Gross unrealized gains, held to maturity securities | 118 |  | 140
Gross unrealized losses, held to maturity securities | (13) |  | 0
Securities, fair value |  | 7,154 | 3,286
Amortized cost, held to maturity securities | 7,049 |  | 3,146
Fair value, held to maturity securities |  | 7,154 | 3,286
Corporate Debt Securities [Member] |  |  |
Securities held to maturity, at amortized cost (fair value, 2021, $33,617; 2020, $14,743) | 2,019 |  | 1,500
Gross unrealized gains, held to maturity securities | 1 |  | 105
Gross unrealized losses, held to maturity securities | 0 |  | 0
Securities, fair value |  | 2,020 | 1,605
Amortized cost, held to maturity securities | $ 2,019 |  | 1,500
Fair value, held to maturity securities |  | $ 2,020 | $ 1,605

X
- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 + Details
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- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 + Details
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- Definition Amount of cumulative unrecognized loss on investment in debt security measured at amortized cost (held-to-maturity) and investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5A -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123581744&loc=SL120269820-111563 + Details
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