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Loans and Allowance for Credit Losses - Loans Outstanding by Class of Financing Receivable (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021 | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Financing Receivable, Past Due [Line Items] |  |  |  |
Gross loans | $ 8,004,976 | $ 7,604,662 |  |
Less: Allowance for credit losses | (120,049) | (125,559) | $ (157,954) | $ (170,389)
Net loans | 7,884,927 | 7,479,103 |  |
Paycheck Protection Program |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Loans originated as part of PPP program | 2,062 | 3,990 |  |
Commercial and industrial |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Gross loans | 1,380,600 | 1,290,565 |  |
Less: Allowance for credit losses | (12,699) | (15,751) | (14,643) | (14,748)
Construction |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Gross loans | 1,468,811 | 1,327,659 |  |
Less: Allowance for credit losses | (31,782) | (28,576) | (38,622) | (58,477)
Residential real estate: | 1-to-4 family mortgage |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Gross loans | 1,346,349 | 1,270,467 |  |
Less: Allowance for credit losses | (21,024) | (19,104) | (19,572) | (19,220)
Residential real estate: | Residential line of credit |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Gross loans | 392,740 | 383,039 |  |
Less: Allowance for credit losses | (6,545) | (5,903) | (9,268) | (10,534)
Residential real estate: | Multi-family mortgage |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Gross loans | 400,501 | 326,551 |  |
Less: Allowance for credit losses | (6,398) | (6,976) | (11,657) | (7,174)
Commercial real estate: | Owner occupied |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Gross loans | 978,436 | 951,582 |  |
Less: Allowance for credit losses | (8,416) | (12,593) | (3,609) | (4,849)
Commercial real estate: | Non-owner occupied |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Gross loans | 1,706,546 | 1,730,165 |  |
Less: Allowance for credit losses | (21,290) | (25,768) | (50,179) | (44,147)
Consumer and other |  |  |  |
Financing Receivable, Past Due [Line Items] |  |  |  |
Gross loans | 330,993 | 324,634 |  |
Less: Allowance for credit losses | $ (11,895) | $ (10,888) | $ (10,404) | $ (11,240)

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