Recurring and Nonrecurring basis (Details) - USD ($) $ in Thousands	Dec. 31, 2019		Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Trading	$ 2,200		$ 1,500
Equity Securities, FV-NI	21,261		19,477
Debt Securities, Available-for-sale	426,424		442,752
Assets
Total	76,705		26,113
Derivative Liability, Fair Value, Gross Liability	53,715		17,523
U.S. government agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	33,115		32,038
Agency mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	247,000		220,105
Pooled trust preferred securities issued by banks and insurers
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	1,114		1,329
Small Business Administration Pooled Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	54,795		51,927
Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Trading	2,179		1,504
Liabilities
Total recurring fair value measurements	507,633		478,951
Fair Value, Recurring [Member] | Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Securities, FV-NI	21,261		19,477
Fair Value, Recurring [Member] | U.S. government agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	33,115		32,038
Fair Value, Recurring [Member] | Agency mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	247,000		220,105
Fair Value, Recurring [Member] | Agency collateralized mortgage obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	88,511		134,911
Fair Value, Recurring [Member] | State, county, and municipal securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	1,396		1,735
Fair Value, Recurring [Member] | Single issuer trust preferred securities issued by banks and insurers
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	493		707
Fair Value, Recurring [Member] | Pooled trust preferred securities issued by banks and insurers
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	1,114		1,329
Fair Value, Recurring [Member] | Small Business Administration Pooled Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	54,795		51,927
Fair Value, Recurring [Member] | Loans held for sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Held-for-sale, Fair Value Disclosure	33,307		6,431
Fair Value, Recurring [Member] | Derivative instruments
Assets
Total	78,385		26,310
Fair Value, Recurring [Member] | Derivative instruments
Assets
Financial and Nonfinancial Liabilities, Fair Value Disclosure	53,923		17,523
Fair Value, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Trading	2,179		1,504
Liabilities
Total recurring fair value measurements	23,440		20,981
Fair Value, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Securities, FV-NI	21,261		19,477
Fair Value, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | State, county, and municipal securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale			0
Fair Value, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Small Business Administration Pooled Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	0		0
Fair Value, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
Liabilities
Total recurring fair value measurements	483,079		456,641
Fair Value, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Securities, FV-NI	0		0
Fair Value, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | U.S. government agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	33,115		32,038
Fair Value, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Agency mortgage-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	247,000		220,105
Fair Value, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Agency collateralized mortgage obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	88,511		134,911
Fair Value, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | State, county, and municipal securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	1,396		1,735
Fair Value, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Single issuer trust preferred securities issued by banks and insurers
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	493		707
Fair Value, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Small Business Administration Pooled Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	54,795		51,927
Fair Value, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Loans held for sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans Held-for-sale, Fair Value Disclosure	33,307		6,431
Fair Value, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Derivative instruments
Assets
Total	78,385	[1]	26,310
Fair Value, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Derivative instruments
Assets
Financial and Nonfinancial Liabilities, Fair Value Disclosure			17,523
Fair Value, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
Liabilities
Total recurring fair value measurements	1,114		1,329
Fair Value, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Equity Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity Securities, FV-NI	0		0
Fair Value, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | State, county, and municipal securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale			0
Fair Value, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Pooled trust preferred securities issued by banks and insurers
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	1,114		1,329
Fair Value, Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Small Business Administration Pooled Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt Securities, Available-for-sale	0		0
Fair Value, Nonrecurring [Member]
Assets
Assets And Liabilities Fair Value Disclosure Nonrecurring	25,515		29,109
Fair Value, Nonrecurring [Member] | Collateral dependent impaired loans
Liabilities
Assets, Fair Value Disclosure	25,515		29,109
Fair Value, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets
Assets And Liabilities Fair Value Disclosure Nonrecurring	25,515		29,109
Fair Value, Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Collateral dependent impaired loans
Liabilities
Assets, Fair Value Disclosure	$ 25,515		$ 29,109

[1] All asset derivatives are located in other assets on the balance sheet