Goodwill and Other Intangible Assets (Tables)
$ in Millions

12 Months Ended

Dec. 31, 2021

USD ($)

Goodwill and Intangible Assets Amortization Schedule [Abstract]

Schedule of Finite-Lived Intangible Assets [Table Text Block]

The following is a summary of the Company's acquired intangible assets:

	December 31, 2021						December 31, 2020
	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
	(in millions)
Subject to amortization
Core deposit intangibles	$	14.6	$	10.2	$	4.4	$	14.6	$	8.8	$	5.8
Customer relationship intangibles	2.5		0.6		1.9		2.5		0.1		2.4
Correspondent customer relationships	76.0		2.8		73.2		—		—		—
Trade name - AmeriHome	9.5		0.4		9.1		—		—		—
Operating licenses	55.5		1.0		54.5		—		—		—
	$	158.1	$	15.0	$	143.1	$	17.1	$	8.9	$	8.2
	December 31, 2021						December 31, 2020
	Gross Carrying Amount		Impairment		Net Carrying Amount		Gross Carrying Amount		Impairment		Net Carrying Amount
	(in millions)
Not subject to amortization
Trade name - Bridge Bank	$	0.4	$	—	$	0.4	$	0.4	$	—	$	0.4

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]

Below is a summary of future estimated aggregate amortization expense:

	December 31, 2021
	(in millions)
2022	$	7.5
2023	7.4
2024	7.4
2025	6.6
2026	5.7
Thereafter	108.5
Total	$	143.1

Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months

$ 7.5

Finite-Lived Intangible Assets, Amortization Expense, Year Two

7.4

Finite-Lived Intangible Assets, Amortization Expense, Year Three

7.4

Finite-Lived Intangible Assets, Amortization Expense, Year Four

6.6

Finite-Lived Intangible Assets, Amortization Expense, Year Five

5.7

Finite-Lived Intangible Assets, Amortization Expense, after Year Five

$ 108.5