Loans - Schedule of PCI Loans Credit Quality Indicators (Details) $ in Thousands	Jun. 30, 2020 USD ($)
Financing Receivable, Recorded Investment
Total loans	$ 2,756,138
Pass
Financing Receivable, Recorded Investment
Total loans	2,694,017
Special Mention
Financing Receivable, Recorded Investment
Total loans	33,803
Substandard
Financing Receivable, Recorded Investment
Total loans	28,095
Doubtful
Financing Receivable, Recorded Investment
Total loans	207
Loss
Financing Receivable, Recorded Investment
Total loans	16
Commercial Loans | Commercial real estate
Financing Receivable, Recorded Investment
Total loans	1,047,084
Commercial Loans | Construction and development
Financing Receivable, Recorded Investment
Total loans	215,344
Commercial Loans | Commercial and industrial
Financing Receivable, Recorded Investment
Total loans	153,263
Commercial Loans | Pass | Commercial real estate
Financing Receivable, Recorded Investment
Total loans	1,028,709
Commercial Loans | Pass | Construction and development
Financing Receivable, Recorded Investment
Total loans	212,370
Commercial Loans | Pass | Commercial and industrial
Financing Receivable, Recorded Investment
Total loans	130,202
Commercial Loans | Special Mention | Commercial real estate
Financing Receivable, Recorded Investment
Total loans	7,580
Commercial Loans | Special Mention | Construction and development
Financing Receivable, Recorded Investment
Total loans	2,723
Commercial Loans | Special Mention | Commercial and industrial
Financing Receivable, Recorded Investment
Total loans	20,439
Commercial Loans | Substandard | Commercial real estate
Financing Receivable, Recorded Investment
Total loans	10,779
Commercial Loans | Substandard | Construction and development
Financing Receivable, Recorded Investment
Total loans	250
Commercial Loans | Substandard | Commercial and industrial
Financing Receivable, Recorded Investment
Total loans	2,622
Commercial Loans | Doubtful | Commercial real estate
Financing Receivable, Recorded Investment
Total loans	0
Commercial Loans | Doubtful | Construction and development
Financing Receivable, Recorded Investment
Total loans	1
Commercial Loans | Doubtful | Commercial and industrial
Financing Receivable, Recorded Investment
Total loans	0
Commercial Loans | Loss | Commercial real estate
Financing Receivable, Recorded Investment
Total loans	16
Commercial Loans | Loss | Construction and development
Financing Receivable, Recorded Investment
Total loans	0
Commercial Loans | Loss | Commercial and industrial
Financing Receivable, Recorded Investment
Total loans	0
Retail Consumer Loans | One-to-four family
Financing Receivable, Recorded Investment
Total loans	469,220
Retail Consumer Loans | HELOCs - originated
Financing Receivable, Recorded Investment
Total loans	137,447
Retail Consumer Loans | Construction and land/lots
Financing Receivable, Recorded Investment
Total loans	81,514
Retail Consumer Loans | Pass | One-to-four family
Financing Receivable, Recorded Investment
Total loans	458,248
Retail Consumer Loans | Pass | HELOCs - originated
Financing Receivable, Recorded Investment
Total loans	134,697
Retail Consumer Loans | Pass | Construction and land/lots
Financing Receivable, Recorded Investment
Total loans	81,112
Retail Consumer Loans | Special Mention | One-to-four family
Financing Receivable, Recorded Investment
Total loans	1,724
Retail Consumer Loans | Special Mention | HELOCs - originated
Financing Receivable, Recorded Investment
Total loans	902
Retail Consumer Loans | Special Mention | Construction and land/lots
Financing Receivable, Recorded Investment
Total loans	0
Retail Consumer Loans | Substandard | One-to-four family
Financing Receivable, Recorded Investment
Total loans	9,042
Retail Consumer Loans | Substandard | HELOCs - originated
Financing Receivable, Recorded Investment
Total loans	1,848
Retail Consumer Loans | Substandard | Construction and land/lots
Financing Receivable, Recorded Investment
Total loans	402
Retail Consumer Loans | Doubtful | One-to-four family
Financing Receivable, Recorded Investment
Total loans	206
Retail Consumer Loans | Doubtful | HELOCs - originated
Financing Receivable, Recorded Investment
Total loans	0
Retail Consumer Loans | Doubtful | Construction and land/lots
Financing Receivable, Recorded Investment
Total loans	0
Retail Consumer Loans | Loss | One-to-four family
Financing Receivable, Recorded Investment
Total loans	0
Retail Consumer Loans | Loss | HELOCs - originated
Financing Receivable, Recorded Investment
Total loans	0
Retail Consumer Loans | Loss | Construction and land/lots
Financing Receivable, Recorded Investment
Total loans	0
Purchased Credit Impaired (PCI) Loans
Financing Receivable, Recorded Investment
Total loans	12,792
Purchased Credit Impaired (PCI) Loans | Pass
Financing Receivable, Recorded Investment
Total loans	8,110
Purchased Credit Impaired (PCI) Loans | Special Mention
Financing Receivable, Recorded Investment
Total loans	2,207
Purchased Credit Impaired (PCI) Loans | Substandard
Financing Receivable, Recorded Investment
Total loans	2,472
Purchased Credit Impaired (PCI) Loans | Doubtful
Financing Receivable, Recorded Investment
Total loans	0
Purchased Credit Impaired (PCI) Loans | Loss
Financing Receivable, Recorded Investment
Total loans	3
Purchased Credit Impaired (PCI) Loans | Commercial Loans | Commercial real estate
Financing Receivable, Recorded Investment
Total loans	5,822
Purchased Credit Impaired (PCI) Loans | Commercial Loans | Construction and development
Financing Receivable, Recorded Investment
Total loans	590
Purchased Credit Impaired (PCI) Loans | Commercial Loans | Commercial and industrial
Financing Receivable, Recorded Investment
Total loans	1,562
Purchased Credit Impaired (PCI) Loans | Commercial Loans | Pass | Commercial real estate
Financing Receivable, Recorded Investment
Total loans	3,181
Purchased Credit Impaired (PCI) Loans | Commercial Loans | Pass | Construction and development
Financing Receivable, Recorded Investment
Total loans	271
Purchased Credit Impaired (PCI) Loans | Commercial Loans | Pass | Commercial and industrial
Financing Receivable, Recorded Investment
Total loans	1,556
Purchased Credit Impaired (PCI) Loans | Commercial Loans | Special Mention | Commercial real estate
Financing Receivable, Recorded Investment
Total loans	1,742
Purchased Credit Impaired (PCI) Loans | Commercial Loans | Special Mention | Construction and development
Financing Receivable, Recorded Investment
Total loans	0
Purchased Credit Impaired (PCI) Loans | Commercial Loans | Special Mention | Commercial and industrial
Financing Receivable, Recorded Investment
Total loans	0
Purchased Credit Impaired (PCI) Loans | Commercial Loans | Substandard | Commercial real estate
Financing Receivable, Recorded Investment
Total loans	899
Purchased Credit Impaired (PCI) Loans | Commercial Loans | Substandard | Construction and development
Financing Receivable, Recorded Investment
Total loans	319
Purchased Credit Impaired (PCI) Loans | Commercial Loans | Substandard | Commercial and industrial
Financing Receivable, Recorded Investment
Total loans	3
Purchased Credit Impaired (PCI) Loans | Commercial Loans | Doubtful | Commercial real estate
Financing Receivable, Recorded Investment
Total loans	0
Purchased Credit Impaired (PCI) Loans | Commercial Loans | Doubtful | Construction and development
Financing Receivable, Recorded Investment
Total loans	0
Purchased Credit Impaired (PCI) Loans | Commercial Loans | Doubtful | Commercial and industrial
Financing Receivable, Recorded Investment
Total loans	0
Purchased Credit Impaired (PCI) Loans | Commercial Loans | Loss | Commercial real estate
Financing Receivable, Recorded Investment
Total loans	0
Purchased Credit Impaired (PCI) Loans | Commercial Loans | Loss | Construction and development
Financing Receivable, Recorded Investment
Total loans	0
Purchased Credit Impaired (PCI) Loans | Commercial Loans | Loss | Commercial and industrial
Financing Receivable, Recorded Investment
Total loans	3
Purchased Credit Impaired (PCI) Loans | Retail Consumer Loans | One-to-four family
Financing Receivable, Recorded Investment
Total loans	4,473
Purchased Credit Impaired (PCI) Loans | Retail Consumer Loans | Construction and land/lots
Financing Receivable, Recorded Investment
Total loans	345
Purchased Credit Impaired (PCI) Loans | Retail Consumer Loans | Pass | One-to-four family
Financing Receivable, Recorded Investment
Total loans	2,994
Purchased Credit Impaired (PCI) Loans | Retail Consumer Loans | Pass | Construction and land/lots
Financing Receivable, Recorded Investment
Total loans	108
Purchased Credit Impaired (PCI) Loans | Retail Consumer Loans | Special Mention | One-to-four family
Financing Receivable, Recorded Investment
Total loans	465
Purchased Credit Impaired (PCI) Loans | Retail Consumer Loans | Special Mention | Construction and land/lots
Financing Receivable, Recorded Investment
Total loans	0
Purchased Credit Impaired (PCI) Loans | Retail Consumer Loans | Substandard | One-to-four family
Financing Receivable, Recorded Investment
Total loans	1,014
Purchased Credit Impaired (PCI) Loans | Retail Consumer Loans | Substandard | Construction and land/lots
Financing Receivable, Recorded Investment
Total loans	237
Purchased Credit Impaired (PCI) Loans | Retail Consumer Loans | Doubtful | One-to-four family
Financing Receivable, Recorded Investment
Total loans	0
Purchased Credit Impaired (PCI) Loans | Retail Consumer Loans | Doubtful | Construction and land/lots
Financing Receivable, Recorded Investment
Total loans	0
Purchased Credit Impaired (PCI) Loans | Retail Consumer Loans | Loss | One-to-four family
Financing Receivable, Recorded Investment
Total loans	0
Purchased Credit Impaired (PCI) Loans | Retail Consumer Loans | Loss | Construction and land/lots
Financing Receivable, Recorded Investment
Total loans	$ 0