Note 2 - Bank Acquisition - Summary of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands			3 Months Ended
		Mar. 07, 2022	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022	Dec. 31, 2021
Goodwill, Ending Balance			$ 194,074	$ 202,524	$ 194,074	$ 135,830
Cash consideration paid			0	30,994
Business Combination, Consideration Transferred, Total			0	167,913
Goodwill			0	$ 66,694
Commonwealth [Member]
Mortgage loans held for sale		$ 3,559
Available for sale debt securities		84,974
Held to maturity debt securities	[1]	161,819
Federal Home Loan Bank stock, at cost		4,436
Loans		632,404
Allowance for credits losses on loans		(9,950)
Net loans		622,454
Premises and equipment, net		32,793
Accrued interest receivable		1,973
Goodwill, Ending Balance		67,000	$ 58,244		$ 58,244
Mortgage servicing rights		12,676
Deferred income taxes, net		(3,727)
Other assets		8,324
Total assets acquired		1,336,815
Non-interest bearing		302,098
Interest bearing		818,705
Total deposits		1,120,803
SSUAR		66,220
Subordinated debentures		26,012
Line of credit		3,200
Accrued interest payable		243
Other liabilities		19,118
Total liabilities assumed		1,235,596
Net assets acquired		101,219
Consideration for common stock		133,825
Cash consideration paid		30,994
Non-controlling interest of acquired entity		3,094
Business Combination, Consideration Transferred, Total		167,913
Goodwill		66,694
Commonwealth [Member] | Core Deposits [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles		12,724
Commonwealth [Member] | Customer Lists [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles		14,360
Commonwealth [Member] | Cash [Member]
Cash and due from banks		380,450
Commonwealth [Member] | As Recorded By Acquiree [Member]
Mortgage loans held for sale		3,559
Available for sale debt securities		247,209
Held to maturity debt securities	[1]	0
Federal Home Loan Bank stock, at cost		4,436
Loans		645,551
Allowance for credits losses on loans		(16,102)
Net loans		629,449
Premises and equipment, net		28,784
Accrued interest receivable		1,973
Goodwill, Ending Balance		5,412
Mortgage servicing rights		9,387
Deferred income taxes, net		0
Other assets		9,389
Total assets acquired		1,320,048
Non-interest bearing		302,098
Interest bearing		818,334
Total deposits		1,120,432
SSUAR		66,220
Subordinated debentures		26,806
Line of credit		3,200
Accrued interest payable		243
Other liabilities		17,822
Total liabilities assumed		1,234,723
Net assets acquired		85,325
Commonwealth [Member] | As Recorded By Acquiree [Member] | Core Deposits [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles		0
Commonwealth [Member] | As Recorded By Acquiree [Member] | Customer Lists [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles		0
Commonwealth [Member] | As Recorded By Acquiree [Member] | Cash [Member]
Cash and due from banks		380,450
Commonwealth [Member] | As Adjusted By Acquirer [Member]
Mortgage loans held for sale	[2]	0
Available for sale debt securities	[2],[3]	(416)
Held to maturity debt securities	[1],[2],[3]	0
Federal Home Loan Bank stock, at cost	[2]	0
Loans	[2],[4]	(13,147)
Allowance for credits losses on loans	[2],[5]	6,152
Net loans	[2]	(6,995)
Premises and equipment, net	[2],[6]	4,009
Accrued interest receivable	[2]	0
Goodwill, Ending Balance	[2],[7]	(5,412)
Mortgage servicing rights	[2],[8]	3,289
Deferred income taxes, net	[2],[9]	(3,727)
Other assets	[2],[10]	(1,065)
Total assets acquired	[2]	16,767
Non-interest bearing	[2]	0
Interest bearing	[2],[11]	371
Total deposits	[2]	371
Subordinated debentures	[2],[12]	(794)
Line of credit	[2]	0
Accrued interest payable	[2]	0
Other liabilities	[2],[13]	1,296
Total liabilities assumed	[2]	873
Net assets acquired	[2]	15,894
Commonwealth [Member] | As Adjusted By Acquirer [Member] | Core Deposits [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	[2],[14]	12,724
Commonwealth [Member] | As Adjusted By Acquirer [Member] | Customer Lists [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	[2],[15]	14,360
Commonwealth [Member] | As Adjusted By Acquirer [Member] | Cash [Member]
Cash and due from banks	[2]	0
Commonwealth [Member] | Classification Adjustments [Member]
Available for sale debt securities	[1]	(161,819)
Held to maturity debt securities	[1]	$ 161,819

[1] As of acquisition date, securities with a fair value of $162 million were classified by Bancorp as HTM.

[2] See the following page for explanations of individual fair value/provisional period adjustments.

[3] Adjustment to investment securities based on Bancorp’s evaluation of the acquired portfolio.

[4] Adjustments to loans to reflect estimated fair value adjustments, including the following: (in thousands) Fair value adjustment - acquired non PCD loans $ (9,216 ) Fair value adjustment - acquired PCD loans (4,094 ) Eliminate unrecognized loan fees on acquired loans and fair value hedge 163 Net loan fair value adjustments $ (13,147 )

[5] The net adjustment to allowance for credit losses includes the following: (in thousands) Reversal of historical CB allowance for credit losses on loans $ (16,102 ) Estimate of lifetime credit losses for PCD loans 9,950 Net change in allowance for credit losses $ (6,152 )

[6] Adjustment to premises and equipment to reflect the estimated fair value of acquired premises and equipment and right of use assets.

[7] Elimination of the historical CB goodwill.

[8] Adjustment to reflect the estimated fair value of MSRs.

[9] Adjustment to net DTAs associated with the effects of the purchase accounting adjustments.

[10] Adjustment to other assets to reflect the estimated fair value of prepaid and other assets.

[11] Adjustment to deposits to reflect the estimated fair value of time deposits in interest rates, which was based on an analysis of market interest rates and maturity dates at the time of acquisition.

[12] Adjustment to reflect the estimated fair value of subordinated debentures for differences in interest rates, which was based primarily on an analysis of market interest rates and maturity dates at the time of acquisition.

[13] Adjustment to other liabilities to establish the reserve for unfunded loan commitments under CECL, operating lease liabilities and various accrual adjustments.

[14] Calculation of CDI related to the acquisition.

[15] Calculation of CLI related to the acquisition.